That's a good point. There's obviously still a lot of unanswered questions but from the small bit of information we know (or think we know), the article stating Barkley will appear for the USA but not classic teams seems to suggest they're separate entities in terms of name rights (which would sort of make sense, since one would be through the NBA and the other not).
Naturally, if that was in fact the case, I think the next question would be what might prevent users from simply adding Pippen to the Dream Team themselves, or adding Chuck to classic teams? Will transactions be locked with the Dream Team? Will players be editable? I'll be curious to find out.