I have been wanting to switch to WP since last summer. That's when I first started taking a look around to see what I would be picking up in October, when my phone came off contract.
I have been with Verizon since the company was first formed, and the coverage is so much better than ATT this it's not a consideration to switch carriers.
I never had an iPhone, although I would have gladly bought one when they first came out (iPhone was originally an ATT exclusive, which is something of a recurring theme as a Verizon customer). I ended up on android because the Motorola Droid (the 2009 version with the hardware keyboard) was the first real smartphone available through Verizon. When iPhone came to Verizon I was already a happy android user, and saw no reason to switch. Quite frankly, my Droid Razor Maxx (my third Droid) is the best phone I ever owned, and by then it would have been inconceivable for me to switch to a tiny iPhone display. At that point I was also rid of iTunes (my iPod was handed down to the wife because I carried my tunes on my phone - drag and drop is so much easier), and I just couldn't see myself being restricted the way Apple required you to be.
In September, two of my daughters were up for renewal, and one got the Galaxy S4 and the other the Droid Ultra. Both love their phones, but by then I was really getting creeped out by the way Google was insinuating themselves into - and indexing - everything. I know they probably aren't indexing every word that a Droid Ultra is listening to, but they are not-so-subtly trying to get everyone on Chrome and Gmail, which they absolutely do index. To paraphrase what someone here recently said, I realized that am not Google's customer - I am their product.
After some reflection, I decided to start migrating away from Google. Unfortunately, with Android, it's not really possible to do so. I created an Outlook.com email account, and began taking all of my personal email there, but the calendar is still an issue. I moved my web searches to Bing, and found Bing to be 98% as good as Google, and improving. Once a week or so, I would find myself visiting Google to overcome a blind spot with Bing, and I used to get the result I was looking for, but recently, Google is presenting me with the same search results.
I use a Surface Pro as my main PC, and I am quite comfortable with Windows 8, which I really like. Unfortunately, Google crippled the integration between Google Calendar and Windows 8's calendar app, just as I have read they did with WP's native YouTube app. The Google calendar is what syncs my work Outlook calendar to my phone (I use a third-party program called CompanionLink), so I really want a phone where I can use my Outlook calendar as my main phone calendar and say goodbye to Google.
With all that said, when Nokia announced the 1520 I was ready to go pick one up that day. It had everything I wanted in a phone, only Nokia made it an ATT exclusive (the oversized nature of the phone doesn't bother me - my wife has a Note 2 and LOVES it). So I have been waiting and watching the forums for news and rumors and becoming more frustrated by the moment. In the meantime, my Razor Maxx has become quite long in the tooth and VERY laggy (maybe not everyone experiences this with Android, but I have tried just about everything and a 3-4 second wait while my 2-year-old phone freezes up is just too much).
If the Icon comes out this month, I fully expect to own one, although I am very concerned about the lack of a SD card slot (I have only 8gb internal storage on my Maxx, but also 32gb external, which is mostly full ATM) and the limited amount of storage on the phone. SkyDrive is nice, but I use already use SkyDrive for my work and I have about 6gb of work files that I use already synced to the HD on my Surface Pro. Buying more space is cheap enough, but then I am up against the limits of my Pro's 128gb hard drive (I use an external hard drive, so storage in general isn't an issue, but you can't sync that with SkyDrive and I have the full Adobe CC suite installed).
I am also concerned about having a bigger brighter screen than my Maxx with a much smaller battery. My Maxx's 3300mAh battery is more than 35% larger than the Icon's battery. It takes me all the way through the day on all but the busiest days - unless I am using it as a 4G hotspot for extended periods. It sounds like I will have to be charging the Icon at some point during most days - not exactly what I am looking for.
If Verizon delays this phone further and I hear about a new WP in the Verizon pipeline with an SD card slot (1520 anyone?) I might wait longer. But if my Razor Maxx dies in the meantime, the Galaxy note 3 is everything I want in a phone, including a 3200mAh battery. I might have to succumb to two more years of Google servitude.