Yeah, seems like something they're just putting back in. Not something to lose sleep over, specially if you got the season pass to begin with. For the record though, the first, second, and some of the last screenshots have parts I've never seen before, which are presumably new. Some of the other stuff looks like it's from 5's DLC (with the exception of that knit hat)
To pick apart, only the 4th screen shot is completely old parts, some of which were from the base games of SCIII, IV, or V.
3rd screenshot has the old denim jacket/pants from SCV. Knit cap is new, correct me if I'm wrong.
1st and 2nd screens are completely new as far as I can tell.
Last screen is tricky. I'm sure I've seen that bird head before, but the winged slippers, and that style of wings on the left... nah. Not sure on the armor or that feathered skirt either, cause, well, the angle sucks in that shot. I can safely say there's more new than old from these five shots though.
GOH: bmc would tell birds that they're broken because they shouldn't air recover.