W
did lumia 520 will get windows 10 update?
Windows 1o will be out next year so no phone has Windows 10 on it yet, although I suppose you meant WILL the 520, the answer seems to be "Probably".
The RAM part would be disappointing. Let's not forget that the 630 has 512mb RAM as well. And wasn't the support for WP 3 years>No 2 year support for the phone will be up when windows phone 10 comes out, besides might need a bigger ram to support future apps