Jam confirmed to be strong in GGAC+R?

Ogawa recently tweeted that he thinks Jam is the strongest character in +R because she has no weaknesses, her offense, defense, meter gain, corner carry and 'damage cost performance' are all really strong. Her corner game is also really scary and is stronger than Faust's. Then he goes on to mention that there's room for countermeasures and Eddie tech hasn't fully evolved yet.

https://twitter.com/ogawaeddie/status/239759634368430081

En: That's great that Ogawa wrote Jam is strong and all but... he doesn't explain exactly why or how... as expected of Ogawa

https://twitter.com/en_ootsuru/status/239942428239478785

(Koichi then En gives the lowdown)

Koichi: so once Jam has gotten one FB charge, both her offense and defense get stronger in one go. Being able to use charged axe kick at any moment now instead of just having to use it as a follow up gives her a really fast overhead, she already has a really strong low game, and she can start a damaging combo from her charged 623k too. If you get hit by anything, it'll become a corner combo thanks to having a charged flying kick. And of course, after getting hit by any one of those, she'll finish her combo with an SB charge and she'll have all those options back.

https://twitter.com/koichinko/status/239954499391860737

Jam's +R changes for anyone who's unfamiliar with them
22D: is now faster than a normal charge and gives her one of each card

236D, 623D, 214D: can now input charged specials with the D button and at anytime, don't need to follow up a special anymore

Unrelated to the tweets but some more of her +R changes
6H: no longer throw invul, ground bounces on air hit, special cancellable on hit or block now, GB decreased from +20 to +10

6H~H: can now be cancelled into 22s and any charged special, has more pushback on block

5K: proration increased from 90% to 80%

3H: new move, it's her old 6H from before Accent Core, landing recovery increased from 6f to 8f

FB Puffball: doesn't wallstick on hit, just knocks down now, is cancellable to charges on hit or block, untech time is 28F

2H: untech time decreased from 25F to 22F, floats less on hit now

There are more changes but these are the most significant.