Tifa is in Dissidia oh my, wow. And she doesn't remember Cloud oh my how convenient. :p I don't think they will actually interact with each other. There will probably just be more vague musing about, "Wishing on a star" or something like that. >.>
You know what's funny about that sentence? It did get some cleriths knickers in a twist because "isn't the lifestream aerith's thing?" All I thought was, "yeah because having Tifa & Cloud connected through the lifestream is so out of left field". But then they do tend to ignore the entire lifestream sequence where the turning point of the game took place and established a deeper connection between Cloud & Tifa.
The most caring, and well-thought out place in all the internet, GameFAQs. Here's the other translated one if you want it.
EDIT: About that awesome family picture Jelly posted, I was looking back through a random collection of old pages in this thread and found it again. Someone posted it on page 130. Don't know why I'm pointing this out, but whatever.