Posting a rather late update, the official Pokemon Card blog has finished off the Swinub line by revealing Mamoswine! Thanks goes to Hannes S. and Vincent for the translation!
Mamoswine – Fighting – HP160
Stage 2 – Evolves from Piloswine
Ability: Thick Fat
Any damage done to this Pokemon by attacks from your opponent’s [R] or [W] Pokemon is reduced by 30 (after applying Weakness and Resistance).
[F][C][C][C] Primeval Roar: 80+ damage. If you have a Stadium card in play, this attack does 40 more damage. If your opponent has a Stadium card in play, this Pokemon heals 40 HP.
Weakness: Grass (x2)