I'll probably stick with WP8, though I initially signed up for T-Mobile's Jump program with the intention of trying out different phones every 6 months. I upgraded to a Lumia 925 two weeks ago, but I like the 925 so much (Nokia Drive is amazing) that I'm not in any hurry to trade in my Windows Phone for something else.
Occasionally, I hear about a new app and invariably that app is not yet on Windows Phone. This can get annoying and make me long to be on some other platform, but then I remember that I only use a handful of apps in the first place, and I rarely do more with fad apps than mess around with the trail and then uninstall them. I don't even use Twitter or Instagram. The app I use the most on my Windows Phone is probably Audible. Otherwise, I mostly use the built-in apps and features like the Me tile for 90% of my social media stuff, plus the People hub, Xbox Music, Nokia Drive, and so on.
The 925's camera is awesome, and a complete 180 from my previous phone's horrendous BlurMaker1000 (tm) Camera. Maybe something will come along in the next 6 months that will make me want to switch, but I really like the simplicity, design and features of Windows Phone. At the moment, the only thing I would want to switch to in 6 months is the 1020, assuming it comes out on T-Mobile.