Valve's three secrets

According to various Gaming news portals Valve's Gabe have said that we can expect three big surprises from them within next 12 months.
It has brought up lot of speculation and so on, but in the end the big question is - does this include HL2 - ep3?

One one had everyone expects them to release it in near future anyway so when they announce it it more likely be a sigh of relieve then surprise.
On other hand the fact that they announce the game will be surprise, as I am starting to give up hope that it will get released.

Personally I would like to see them update the engine. It has served well over the years and is a scalable engine, but it is still DX9 and DX11 looks like something that might stick or at least have brought enough to the table to warrant an update.

On some sick level I have a feeling that one of the surprises will be HL3. Essentially that the EP3 has taken so long because it have actually turned into HL3.

I would really like to see them announce another big new IP. Portal was great, L4D is good, but I still want more.. :D But we should not forget that adding another IP to the mix will mean that it will take even longer till next HL. It is a tough world we live in!