say I have the Atom with Bril tact & a team of spiderman TA and ultimates TA

so I go to brilliant everyone I can sees attack up, with perplex copying the JLA. if I then make an attack that same turn but change my wildcard to Ultimates...do I still keep the Perplex bonus

I don't know what the ruling is right now but as soon as JLA releases the answer will be no because the new Brilliant Tactician only works with Team Symbols and Keywords.

Until Justice League becomes tournament legal, Atom can use BT to boost the values of every Wildcard which copies the JLA TA. They will retain the bonus even if they change TAs later as long as the character isn't KOed, damaged or healed.

After Justice League become tournament legal, as mentioned, the revised BT goes off team symbol instead of team ability, so Atom could only boost actual JLA members or characters with the "Scientist" or "Justice League of America" keywords.

WK precedent is that when a revised version of a card is released, previous versions are corrected to match. (Trick Shot)

Since the old version of BT is retired, don't expect official word from WK on the matter. If in doubt, ask your local Judge.

-J

I don't quite agree with this. The Poor Teamwork BFC has been reprinted twice, each time with a new wording, and there has been no errata issued for the previous cards. So there is precedent of both changing and not changing.
This, however, is more to the point. Since the old BTs are retired, they are most likely considered irrelevant to WK.