Level cap increase & the content that comes with it will be nice (IF THEY ACTUALLY MAKE CONTENT), but i would rather have an outline for the final level.
This probably needs a few more core meetings on their part before it's set in stone.

If it's only 5-10 levels every 2 years then it's going to suck if they keep obsoleting older items. If they can somehow manage to keep some of the horizontal progress to compliment the new content then it could be golden.

Not going to worry much about this for now though, it's a ways off.