yes, Q2A's development is going on, although it's only one developer who works on Q2A's core(gidgreen).
usually there are small updates and fixes in sub-versions (like Q2A 1.6.3) and important updates and new features in main releases(1.6 & 1.7 ,etc...). check out changelog.
since Gideon hadn't asked for suggestion for next major release it's safe to say that it's not comming any time soon and there will only be very small changes in next few version. so you can start your redising without minding platform changes.