The development team is running a few processes to ensure that best answer and post count are as accurate as they can be today, and started yesterday. You might see some variation as the statistics resolve, but take heart - the count will be accurate once the process is finished running.
Post count and Best Answers count should, as of today, reflect an accurate account. There were some very old threads which were purged some time ago (mostly from moderator actions) that were eliminated, but that were providing an increase in count to those users that the dev team is looking into restoring as a part of the count, but beyond this, all should be in order.
Regarding updates and new developments, we're not setting any timelines as of yet, but much of what was discussed is being sussed out in the roadmap and the details are emerging. I'll be sure to communicate these as soon as we have definitives. (In particular, the uber-badges are looking really cool.)