First off, I'd probably go apeshit if blood were involved in this match. I know it's unlikely, but hey, it was unlikely last year that they'd use chairshots to the head in their match, so there's always a chance. As for the buildup/the feud/the match itself, as soon as HBK announced his involvement, I knew it was going to harm the match. The buildup hasn't been great due to his involvement- I think everyone would like it much better if it were to be a straight-up brawl between HHH & Undertaker, as their matches in the past at WM have been awesome. Nothing against HBK, he's great, but just not needed at all in this scenario. I wish he were involved in something else, anything else, but this match. But he is. So instead of just watching the match, we have to keep an eye on HBK and wait for him have some sort of impact on what would have been a great match if left alone. And if he has no impact at all, then it may be even worse. I know it sounds like I'm contradicting myself, and that's probably because I am. It flusters me that much. Not really, but anyway, should be a good brawl, and I hope they either escape the cage and/or go to the top. I doubt they go up top (however I'm not givng up hope, similarly to how I'm not giving up on blood), but I would at least hope that they escape the cage and maybe get a table involved.
Obviously Undertaker wins, but that certainly doesn't take away from the match in my opinion. They're all predetermined, so who really cares? As long as the means to the end are entertaining, we win. I just hope HBK doesn't factor into it too much, but I know that's alot to ask for/probably won't happen.
One last point, and this is just for the sake of argument, because I know 'Taker will win, but here it goes: some people have been debating on whether or not Triple H would be a good choice to end the streak. Most are saying no way, while others rightfully see that he'd be a fine choice. Look at the Streak as a long title run. If they were to book an end to it and it was a title run, would you want it to "elevate" someone (meaning some like a Cody Rhodes/Wade Barrett/Sheamus/Ziggler,etc. would end it) or would you want him to be beaten by someone who's believable and of equal caliber (Triple H/HBK/John Cena,etc.), thus not making it look like that much of an upset? If you're concerned with the "sanctity" of the title run (the Streak), then it would make more sense to do the latter. Although it'd be considered an upset, it be much more feasible and stomachable if HHH defeated the Undertaker, not a Cody Rhodes, for the above reason. It'd be acceptable and understandable, and I'd challenge anyone to make a legitimate point otherwise.
Undertaker wins after an exciting, brutal, close match with HBK's involvement in some way or another.