Difficult to read too much into last season from the Welsh regions point of view. Blues were in full re-build mode, and the O's has too many key injuries + a dreadful start to the season. Scarlets too had a great start of the season, which papered over the dreadful second half, and allowed them a top 6 finish.
This season looks very different from the Blues and O's perspective. Wilson has gotten the Blues playing some great stuff. Really organised, but with some great ball in hand stuff. Barring loads of injuries, or a massive dip in form, they'll be gunning for a top 4 spot, let alone a top 6. This is the trust I place in Danny Wilson, as he's a coach of the highest order imo. Halaholo to come in yet as well, and the Blues style of play should really suit him.
Ospreys are historically a top 4 team, with last season being the exception. They never recovered from their shocking early season form, and really struggled in the midfield without the likes of Beck. With a good start, I think the O's will also make the top 4.
Glasgow will make the top 4 as well, so imo this year we'll only see one Irish province there, either Ulster of Leinster. In the first 2 games, I've not been particularly impressed with Muster. Well beaten in terms of possession and territory v Scarlets (Scarlets are incapable of doing anything with it atm though), and but for one of two players and a lucky try v Blues, they were distinctly second best overall there too. Their tactics appear to be kick, kick and more kick + Stander carrying (great player btw). Unless they can add some more strings to their bow, I can see them struggling.
Connacht I think will continue to struggle. They've lost a few too many key players, and I think the other teams will be better this season without disruption of WC.
I'm hoping the Scarlets will come good. That backline should be too good to keep quiet for too long + their forward pack is half decent on paper (especially what Rob Evans + Samson Lee return). Their coaches should be taking some flak imo, because there doesn't seem to be much structure or game plan with ball in hand. I think overall they'll struggle this season. They may end up battling for 6th spot if they can get things sorted, but after the first 2 games, I'm not too sure at all.