I've noticed that pretty much every non-LTE Lumia now only have 512 RAM: 720, 620, and 520. This concerns me because I'm wondering if there's any possibility that future WP8 updates over the next 2 years may require devices with at least 1GB RAM. I've seen this question pop up in comments quite a bit. Do you think it's a valid concern? Mind you, at $250 off contract it's not a huge deal, you just ditch it when it becomes an issue but I am curious if anyone thinks this might happen.