Here's some combos that work as of V1.0:

JAB -> DTILT -> JAB -> DATTACK (20%, builds 22 meter, works at almost any %)

UAIR -> JAB -> DTILT -> JAB -> USPECIAL -> NAIR -> UAIR -> land, jump -> FAIR -> MASENKO (90%, builds 144 meter)

(USPECIAL -> fastfall -> JAB x2) x3 -> FSTRONG (63%, builds 188 meter)

DSPECIAL -> JAB -> USPECIAL -> NAIR -> FSPECIAL (53%, builds 207 meter, only works on large/heavy characters)