My impressions from elsewhere:
Played through Kasuga's drama route last night on hard. Had Kenshin as my partner. Capcom has managed to make this game even more insane-- One stage was a battle against forest animals. You have to defeat Yamanaka Shikanosuke's deer, who is being protected by bears, moles, and other creatures. Those bears do a shitload of damage if they get to you. :lol Some stages now have a roulette wheel symbol on them. When you play these levels, you'll come across enemies who make the wheel spin or you'll get it when defeating enemies holding an outpost. This causes all kinds of craziness. You might turn into one of those giant 'spider' tanks and can smash through enemies. You might turn into a bomb-throwing enemy NPC. On one level, I turned into a samurai who caused large gold coins to drop everywhere. His attacks were one-hit kills...even against the stage bosses! While the game play is still the same from SB4, there are some new moves for the older characters and you can now switch and play as your partner right from the start-- in SB4 you couldn't do this until getting a character to level 50. This can make harder fights much more bearable, since if either character is defeated, they can be brought back with full energy (their lifebar fills back up slowly, but if you stand near them it goes up much faster) and the game will not end until both characters are down. Some battles can be pretty challenging at a lower level, however, with certain enemy attacks killing you in just a few hits. It took me a while to win a fight against Fuuma Kotaro and Matsunaga, for example, since my characters were way underleveled.
Didn't try any of the new characters (well, Kasuga and Kenshin are newly-playable in Sumeragi, but there are a few new or newly-playable characters who weren't in previous games) yet. Will do that tonight. The returning characters also feel more "complete" compared to their SB3 Utage versions, with full movesets and multiple supers like everyone else this time around.
I don't know about the PS3 version (assuming it's the same), but the PS4 version of Sumeragi also contains all of the content from vanilla SB4. If you have SB4 on PS3, you can update the game and upload your save data for use on PS4, much like Koei does with their musou games, carrying over all your progress. They've raised the level caps to an insane 999 now.
The game runs buttery smooth on PS4. It's 1080P and a rock-solid 60 FPS, which looks great and is more impressive than Koei's titles given the speed of everything, although the models can look a bit dated in close-ups and it appears that some small in-game cut scenes are using video instead of being done in real-time.
Sumeragi is definitely worth picking up. Chances of it coming out in English are pretty slim, however.
