The code as-in in git master is very close to what will be released as 0.10. There are no large merges pending anymore, or large blocker issues. The last few days have been mostly small bugfixes.
Issues and pulls still blocking the 0.10 release can be found here (but doesn't include all the small stuff):
https://github.com/bitcoin/bitcoin/milestones/0.10.0You can help by testing the current master. It would be good if the current state got some testing before the first release candidate.
I'm waiting with the rc release until Cory gets back from holiday next week, to handle build system issues which will likely come up with the new release process and gitian.