My first concern about the expansion is this: how is there NO Swampert? Apparently that makes Swampert the last starter to be released as a card from BW (excluding the HGSS starters), and seeing as it's my favourite starter I was terribly disappointed in TPCi for ignoring it. I hope it will be a Plasma Pokemon in BW9, and it better be better than Blaziken and not worse than Sceptile.
Back to the actual thing, here are actually a lot of playable cards in this set, and those that stand a chance of having real usage are really amazing. My focus is on Latias and Kingdra, for reasons unknown. Plasma decks also got a huge boost with Metagross, Umbreon and Glaceon. Metagross' Ability means that it can stream Plasma Pokemon, which is highly beneficial. However, Plasma Pokemon are usually the final evolution. As for the 2 Eeveelutions, they can support with more HP and lesser/no retreat for the Active. There are more threats in the expansion, and these here aren't the only one.
Dammit, I'm gonna have to wait 3 months. Does TPCi not like Mudkips?