well, imho, i think there will be 6 speed for tls (yes tls only) but it won't be on the current generation. my reasonings are as follow
1) the cls and tls would probably get 6 speed for different reasons. the cls got the 6 speed mainly coz' its sales are not as good for the past yr or so, and acura wanna use this to boost up the sales. remember, honda already siad that if the sales of cls doesn't increase this year they will think about discontinuing the whole line.
tls is another story. the sales of tl has always been good, the addition of 6 speed is purely from a enthusiasts point of view. so unless there are really sufficient reasons for honda i don't think they will throw in the additional cost to make the 6 speed, at lesat on the current generation
2) i dont' think there will be 6 speed on the current generation coz' this yr (2003 model) would be the last year for this generation. honda has said that the tl would be totally redesigned for 04. and from the spec of the upcoming accord we can probably get some "hints"
3.5 v6 is possible, though staying with 3.2 v6 is still ok for honda. hp it would probably be around 300hp stock for the tls, which is not very surprising. and with all these figures, it would give honda more sense to actually make a 6 speed model rather than the current 5 speed auto where the power loss is substantial.
so from above, i don't think acura will really focus on putting 6 speed on the current generation of tl, coz' it has very good sales already and putting in more cost for 6 speed doesnt' make sense coz' the new model is coming out next year anyway.