Imma look at each class and see which deck type is likely their best bet or most popular
DK - aggro seems to be the one for either frost and unholy; blood might be played as that control deck that tries to counter aggro, but that’s likely the more of a counter deck option than the “mainstream” choice
DH - combo is losing jace and kurtrus hero among some stronger pieces, while the outcast stuff seems to lean towards aggro. But relics is and some big demon stuff still around so maybe combo will still exist alongside new aggro DH?
Druid - the asta or even sire stuff will probably still be attempted, but without guff the token stuff may be their best bet (even though token druid is gonna have to rebuild itself after rotation
Hunter - there are new big beast stuff, but they may take more time to develop, so hunter will likely do normal hunter things which is tempo/aggro
Mage - no more rune of archamge, no more varden and ping, so the big spell late game stuff is likely to take back seat to arcane burn/aggro
Pally - no more cariel, the new big pally stuff likely takes time to develop, so yeah, pure pally it is
Priest - shadow priest should still be good, naga stuff is still around, but this is priest so the class may find some new control deck to annoy people with
Rogue - combo class is likely going to stay combo.
Shaman - haven’t seen many murloc or other aggro shaman. While their slow decks lose stuff like the hero, they do get new greedy stuff like JIVE INSECT
Warlock - they lose a bit of imp stuff, but not all, and the new take fatigue damage cards seem to push more aggro. I think Rin and/or symphony decks will be the new tickatus though (as in, it’ll be a popular deck but not necessarily meta)
Warrior - I’m not sure what the latest opinion the community has on warriors, but last I heard things still don’t look good for the class. Talk of tony warrior range from meme to it’s the best the class has to offer.
So to recap…
Dk, Pally, Hunter, Mage - very likely to go aggro, only a few would try control or combo
Druid, DH, priest, wariock - likely to go aggro, but control or combo deck types may still be popular
Rogue - combo
Shaman, warrior - unlikely to go aggro