I mean we get excited about anything that our lovely Shannen does. But the chance to see Brenda again, to see what happened to her after she left, the chance to get some closure, if only for a season. It's something 90210 fans old and new have wanted since they saw the end of season four. It's something Shannen has commented on in interviews and at the reunion show.
She can be in one episode for all I care (although from the fact that she's going to direct a musical she'd have to be in more than one)... I will watch every episode she's in and think of how wonderful Shannen is in it.
My little cousin (who is both a Shannen and Holly fan) says she's going to come over and watch the episodes with her in with me. She's turning into a right Shannatic, it's hard for me to find Holly movies that are suitable for her to watch but she adores Shannen now and I think she's going to love watching her in this. Especially if she sings! I think we all want to see that though
*hugs*
xoxoxo