Yea, OCS orders for Active side are all interim/TDY. So you can expect to get your BAS to be taken, but that should be obvious as you are getting housed and fed. In 2012, they put an amendment in the rules that highlighted that Active Duty service members without dependents will retain their BAH, as they aren't given any allowance to move their HHG. To be fair to the site, the misinformation doesn't stem only here, but also from the Student Control personnel at OCS, who told me multiple times I should not get my BAH - I then spoke to PSD and they said to just ignore them, as I was entitled to it.
OCS was a TDY / Intermediate Training, but on my original orders I had no follow on. I assume they do that due to the amount of candidates that go on HOLD and how the detailer for your designator hasn't actually cut any orders for you. As far as I remember, my orders were Temporary and very similar to a Training TDY. Once I got to Candio phase they cut me some orders for my Ultimate Duty, which then showed OCS as an intermediate stop, followed on by my ultimate, Naval Intelligence Officer Basic Course in Virginia Beach.
Hope this information helps, as I can remember reading this thread and leaving somewhat unsure back in July of this year.