The latest expansion didn't raise the level cap so if you have Kunark you're still capable of max level stuff. The expansion added new dungeons and crafting/harvesting content, so if you're really into those things you may want it but it's nothing game-breaking enough to be a necessity.
If either of you do come over feel free to look either me or my husband up. My main is Taigris and his is Felnadir. I'm not capable of much grouping since my characters are crafters, but other than that I'll help you get established as much as I can. My husband currently belongs to a raid guild and is really good at getting groups together and helping people out so you can talk to him if you're interested in that. He also does daily shard runs and between the two of us we can craft both T1 and T2 shard armor.
I have also been saving up for a while to be able to eventually help form a guild and guildhall, and having crafters means I could help level a guild up pretty quickly to unlock its amenities, if we were to have enough accounts between us to get that started. But we should probably wait till we hear about what ToJ is doing since they would be more experienced in that area.
~ Taigris