"Cas specifically for the finale will still be heavily tied in to what is going on with the brothers, particularly Dean’s story." If you believe the rumors going around then nope, that won't be the case, and there won't be much Cas at all in it. But who knows if this is true, I usually dont believe these things but spn has a good track record with leaked spoilers.
Yeah, I don’t believe those rumours one bit. Yes, SPN has had leaks in the past that have been accurate, but it also has people pretending to be ITK (and always “I know someone who knows someone” types) who seem to exist purely to try and wind up Cas/Destiel fans. Given that those rumours say that there’ll be hardly any Cas, yet we know for a fact that Misha was filming for at least half the filming days for 10.23, I’m gonna go ahead and say that that was just another shit stirrer. Some of it will be accurate (because what finale doesn’t have a huge amount of brothers stuff and angst and broments), but the rest? Nah.