Fleshraker Dino Wild/Poly + Powerful Build Race &/Or Imp. Trip/ Grapple

[dirkformica]

If I have a Druid with the racial feat Powerful Build or something similar, I'm treated as being a size larger for several maneuvers (such as Trip.)  If I Wildshape (Druid, etc.) or Polymorph into a Fleshraker MM3, when I Leaping Pounce, does my size count as one size larger?

For a specific example: I'm Human, with the Jotunbrud feat from Races of Faerun, Druid 5 with Improved Trip and Improved Grapple, and I Wildshape into a Fleshraker with Leaping Pounce, am I treated as Large Sized with a bonus based on Str and +4 from the feats Improved Trip and +4 Improved Grapple?

Addendum: What's the difference in rulings if you use Errata for Wildshape vs. original printing?

Edit: Any difference if it's the updated Powerful Build from races like Goliath and Half-Giant?  There's slightly different wording between what seems to be the prototype (Jotunbrud) and the eventual trait (Powerful Build.)

[Havok4]

You would retain the effective size increses due to the way wildshape work. You keep special qualities of your base form.