I am wonder why don't you update the Persian translation with the one on Transifex website. I was translating all script into Persian language.
2.7 release branch has forked and we've started using it on cloud. I expect the open source official release will be along shortly. The marquee feature is a brand new text editor with a new interface designed from the ground up. It's available as an addon, so you can move to it when you're ready, regardless of when you upgrade core. I should also note that file uploads in it are currently restricted to images, so you may not be quite ready to switch if your site does a lot of file swapping via comments.
Full release notes will accompany the actual release.