http://www.capcom.co.jp/blog/sf4/development_blog/2011/02/08_3035.html
E.HONDA
-j.MP hitbox changed. Still strong as an air-to-air, but will lose more often against ground opponents
j.MP's hit box in Super
j.MP's hit box in AE
-(diagonal) j.HP does 100 damage
-st.HP does 120 damage in the first 3 active frames, 80 from the 4th frame after, so know it will do less damage when use as a poke against ground opponents
GOUKEN
-LP Kongoshin (parry) has armor below the waist; MP has upper body armor for use against standing attacks; HP has armor above the head, for use against air attacks.
Kongoshin's armor box for LP, MP, HP, respectively
-Knowing which to use is essential, and although a bit difficult, the move has a 1F start-up and is very strong, so try to master it
-EX is the same as before
ROSE
-Other than the previoiusly mentioned changes, Soul Spark meter built has been adjusted (most likely less)
-cr.MP has a 4F start-up, and the hitbox is sticks out in front of the hurtbox, making it easy to use for pokes, combos, and such.
cr.MP's hitbox
-Because Rose floats on her muffler when using st.MK, she has no hurtbox at her feet, making low attacks whiff and stuffing them
st.MK's hitbox
IBUKI
-Ibuki's trajectory after backjump Kunai is slightly different, leaving her close to her opponent in AE
-The damage is also reduced from 50 to 30, so be aware that it will lower her combo damage
Kunai's throwing position
Landing position in Super
Landing position in AE
SETH
-st.MK's hurtbox reduction and extension of its active frames to 3 makes it easier to use as a poke than before.
st.MK's hitbox
-In Super, the unique attack Yosokyaku (head stomp) had a hitbox from active until Seth reached the ground. In AE however, the actives are only there from the end of start-up until 3F later
-Depending on the character and position, Shoryu FADC Head stomp is more difficult to do
AKUMA
-UC2 has larger hitbox only when activated from Teleport
-It's now easier to heavily punish opponents who try to read a runaway Teleport
-With good timing, it's possible to catch Yun's lunge punch, Yang's roll kick, and other long-reaching specials, as well as each character's footsie attacks.
UC2's normal hitbox
UC2's hitbox from a Teleport cancel
Next week is Blanka, Abel, Gen, Makoto, Dee Jay, and T.Hawk.