At the start of training camp, I'd have guessed they'd simply go with everyone on a one way contract, which convieniently broke down to 14F, 7D, and 2G - making it more or less seem as though the team was set before training camp. Which more often that not, it is, aside from a spot or two.
With training camp winding down (even though there are still 3 games to go) I'm not sure things have much changed. To me, the safest guess still looks very much like a 23 man roster to open the season, consisting of:
Smyth Peca Hemsky
Moreau Horcoff Dvorak
Torres Reasoner Pisani
Harvey/Rita/Winchester Stoll Laraque
extras: two of Harvey, Rita, and Winchester
I'm not sure if EDM would mind an injury to one ofRita/Harvey allowing them to get a longer look at Schremp, but it wouldn't surprise me that they'd seen enough of Schremp to either send him back, or keep him. If they decide to keep him, it's hard to know who they'd move to do so. There's no one left who could be sent down without having to pay them their NHL salary, so a trade would probably be the best option were one available. In that case it depends on who's worth what to other teams, and who is more expendable, etc. My guess would be Rita as the odd man out, especially if no trade can be worked out and it's true that EDM could send him back to Europe while retaining his future rights.
I'm also hopeful that we'll see Pouliot become a permanent member of the Oilers by the end of the season, but this would depend both upon his performance with the Bulldogs and also how the 3rd and 4th line Oilers adjust to the new NHL rules, assuming they are called as they are being called now, going forward. Additionally, if they decide to keep Schremp, it's hard to imigine room being available for Pouliot as well, unless there are a bunch of injuries (knock on wood).
On defence, Syvret has had a solid first training camp, but would benefit from AHL time - if they can find a spot for him. I'd have to think they will find one for him now, given his performance in training camp. The Oilers certainly won't want to stunt his development if they can avoid doing so.