I interned at Bloomberg this summer and there was an announcement that B2 (what you're maybe referring to as V2) will be sunsetted, although some of the major improvements will be ported over to B1 (the "original" version). Unfortunately, tabs were not one of the things they'd be porting :(

B1 recently gained tabs. They still haven't figured out how to reflow text like B2 did though.

Oh no! That's a shame to hear. I did prefer using new tabs instead of new windows.