My opinion on the Kraken is, if you want a pocket carrier, now you have one choice. N'uff said.
I think it is too early to have an opinion on the Valkyrie. We need to know about speed and how much a hit it can take. In general, I think the idea of a large target, slow dropship with lots of guns is looking for trouble. Assault transports don't need to be armed for their central role. If you're outside that role, then guns are always good, but IMHO, faster, or stealthier, are generally better options. So I hesitate to see this is an improvement over the Hoplite. Not sure if it's better than the Reclaimer since we don't have specs. Very different philosophy than the Prowler.
I love stealth, so I am planning on putting out the pesos for a Prowler. This has not won me over yet. Certainly don't need both, and the Prowler is more my style.
There's no doubt it is a very cool ship. For looks I certainly would choose it over the Hoplite, the Reclaimer, the Redeemer and the Prowler. It is that purtiful. Don't plan to fly it alone though, as you would be looking to get everyone aboard dead very quickly. I can't believe they will make this nimble enough to avoid missiles and torps. This is a prime target for an Eclipse S5 torp. I'm guessing you'd need only one, and it would about NEVER miss a target like this. When people see how much NPCs cost, they are going to be very hesitant to risk them in this bird. You can't buy insurance on NPCs. So my uninformed guess is, for speed use the Hoplite, for Stealth use the Prowler, and for big bird planetary landings, use a Polaris. The marines are worth the protection, IMHO.
Now if you can keep big guns off this thing, it is a master at ground force suppression. Check out the lower turret action, and imagine this thing hovering over enemies that can't hurt it. Very different approach from the fewer but bigger guns on the Prowler:
Jollies:
View: https://www.youtube.com/watch?v=HmmYNs_lRCs