You can grab the right version of Gravity here or simply grab the N8/E7-compatible version's SISx file here.
The changelog for this version (since the last full release, I assume) is:
New Feature: App.net support
- See your timeline, your mentions, friends and followers
- Read the global stream, check out new users and follow them - if you like
- Fetch threads or search for #hashtags
- Preview images posted to App.net just like you’re used to on Twitter
Improvements & Bug Fixes
- Network Stack rewritten and optimized (for slow connections)
- Screen rendering performance improved
- On older S^3 phones (N8, C7, E7), the screen is rendered at 60 fps like on Belle FP2 phones
- Foursquare: the “Map” button for your profile works again
- Facebook: the “Send Message” button on friends’ profiles works again
- Del.icio.us: tagging of URLs uploaded to Delicious.com is fixed
- Integrated web browser improved for S^3, Anna & Belle
- Twitter Profile view finally shows “FOLLOWS YOU” again
- Profile view optimized - still not 100% fine on older S60v3 phones
Highly recommended. Jan Ole urges people to "please let me know if the scrolling on S^3 (N8, E7, C7) is better …" - follow him on Twitter and tweet him with your comments!