My guess is, the 1/2 Reborn will be a 2 mana common Neutral or a 1 mana common for Paladin, and the 2/5 Taunt Reborn will be a 4 or 5 mana Paladin or Neutral rare.
Neither of these has a skull for Deathrattle or a Lightning-sign for Trigger/End of Turn effects. They could have battlecries, but it wouldn't really make much sense with Reborn.
So, a vanilla 1/2 reborn is basic enough to be a common, and as a neutral, it has to cost more than Murmy. As a Paladin card, it would be allowed to cost 1, though I'm not sure it also will.
As for the Taunt: I'm not sure how Team5 counts Reborn. A vanilla 3 Mana Taunt has 2/4, and a vanilla 4 Mana Taunt has 2/6. So, a 2/5 with an added effect should cost 4, but with the Reborn, it is almost on the level of Sludge Belcher, so maybe it would cost 5 instead.
And then, Team5 has said a few times they are careful with adding strong neutral taunts, since they can become too popular, as with Sludge Belcher and especially Giggling Inventor. So it would make sense to me if it is a Paladin only card. Then it could either cost 4 to be a good class card, or 5 to be "fair" like most cards.
In the video where the paladin quest is revealed we have some extra minions leaked
I guess those are a paladin 1 mana 1/2 reborn, and a neutral 4 mana 2/5 reborn, maybe demon, maybe not
https://www.youtube.com/watch?v=9zwVKJl7USY
Yeah 2/5 will be revealed at 29th july. Idk about 1/2, i'm not sure if i've found it.
Actually i think it is probable a card created by another one
could be, i thought in a paladin minion since their quest is play reborn minions
My guess is, the 1/2 Reborn will be a 2 mana common Neutral or a 1 mana common for Paladin, and the 2/5 Taunt Reborn will be a 4 or 5 mana Paladin or Neutral rare.
Neither of these has a skull for Deathrattle or a Lightning-sign for Trigger/End of Turn effects. They could have battlecries, but it wouldn't really make much sense with Reborn.
So, a vanilla 1/2 reborn is basic enough to be a common, and as a neutral, it has to cost more than Murmy. As a Paladin card, it would be allowed to cost 1, though I'm not sure it also will.
As for the Taunt: I'm not sure how Team5 counts Reborn. A vanilla 3 Mana Taunt has 2/4, and a vanilla 4 Mana Taunt has 2/6. So, a 2/5 with an added effect should cost 4, but with the Reborn, it is almost on the level of Sludge Belcher, so maybe it would cost 5 instead.
And then, Team5 has said a few times they are careful with adding strong neutral taunts, since they can become too popular, as with Sludge Belcher and especially Giggling Inventor. So it would make sense to me if it is a Paladin only card. Then it could either cost 4 to be a good class card, or 5 to be "fair" like most cards.
So, that's my prediction.
You are rigth, i completely forgot about it, for 4 mana second Sluge Belcher would be insane
Taunt looks like a bone wraith like Marrowgar