I think 90% yes especially with the leak of possible Stone Cold vs Roman Reigns match by fightful
I think the only reason he wasn't there at Raw 30 is because he will enter the Royal Rumble
Otherwise why would the biggest star in Raw history won't be there at 30th anniversary
Your opinion?
I don't think he'll be in the Rumble, no. Based on all recent rumors, I'd say there's a small chance yes, but ~10%, definitely not 90%.
Austin is the biggest star in history (excluding Hogan let's say, whose much older). If he returns, it's to win - so if he is in rumble, he will win.
I think if they want Stone Cold involved at mania this year in a match (not Reigns/title, something else) - that's another reason to keep him off Raw XXX. Don't spoil an Austin presence on Raw XXX when they're not yet ready to kickoff a WM build, since the show is loaded with legends anyways...maybe they're saving his return on Raw for closer to mania to make it more special.
Also - it seems all previous raw anniversary shows have been centered on Austin...it always seems to end with Austin stunning vince - and sometimes his family too - for old time's sake. As much fun as that is, it's been done too often, probably not a bad thing to keep him off Raw XXX and keep him fresh for a potential mania program.