I always get the feeling in these types of threads that people think that EP3 will be the end of the Half-Life series or Gordon Freeman, or some “final goodbye” before Valve does away with the series altogether. It’s not.
To re-iterate:
EP3 is the last episode.
EP3 will end the Half-Life 2 story arc.
That is all.
The Half-Life series is Valve’s baby, it’s what made them and certainly is what kept Valve and Gabe afloat in the early years. It’s their flagship product and they’re not going to just dump it after episode 3.
It’s annoying that they’re not saying anything, but they might be scared of the mistake of what happened before Half-Life 2 was released, the false promises and delays, or doing a repeat of the “Alyx falling off the bridge trailer” for ep2. Anything would be nice though, E3 was a another disappointment.