Yes, the style system was replaced with a stance system, where you have both Angel and Demon forms, switching between them by holding LT or RT, different weapons have different skills, so even though you can't change your styles to Gunslinger to perform Rainstorm and then change it to Swordmaster to perform Prop Shredder, you can press A + X to perform Rainstorm, and with Osiris equipped as your angel weapon you can press LT + B to Prop Shredder.
The d-pad will be used to change your equipped weapons, giving you a greater variety of weapons to change on the fly.
About my thoughts, well, I really like the reboot, I like the new Dante, Vergil, Mundus, the Malice concept and what we know about the story, but when it comes to gameplay, well, it looks good, not DMC3~4 good, but still good, but of course I'd rather have Itsuno + Neo_G on the combat and MT Framework being used to achieve 60fps.
It will probably have the best combat around aside from DMC, Bayonetta and Ninja Gaiden.