Greys Anatomy - Dominic Monaghan joining to Grey's Anatomy?

New Update: IGN.com confirms Dominic Monaghan has joined the cast of Flash Forward. Source

How very sneaky of you, ABC.

I just found out why Dominic Monaghan is appearing in ABC's new promo campaign, and it has nothing whatsoever to do with Charlie being resurrected on Lost next season. But that's exactly what the network wants folks to think. Why? Because they're trying to keep under wraps the real reason he was playing table soccer with Patrick Dempsey, Courteney Cox, and Ed O'Neill in that clip.

This is the part where I warn you of an incoming spoiler and give you one last chance to bail before continuing on...

Okay, here it goes: The real reason Monaghan is featured in that cheeky spot is because he's actually joining the cast of another hour-long ABC drama series as a full-time series regular. And the net's brass want it to be a surprise.

A big surprise.

As a result, they've kindly asked me not to ID the show he'll be joining. And, being the understanding and cooperative creature that I am, I very reluctantly obliged.

The fact is, assuming it doesn't leak elsewhere, it will be a neat surprise.

Source: Ausiello, EW

Here's where the conpsiracy theory starts to kick in. Why wouldn't ABC want people to know which show Monaghan, a popular actor fresh off a role in the summer blockbuster X-Men Origins: Wolverine, would be joining? Could it be because the show Monaghan is joining is 'Grey's Anatomy', and making the announcement could spoil the show's summer cliffhanger? Could Monaghan be taking over the role of George O'Malley from T.R. Knight?