If you're not closed up in the rear end, the your surgeon maybe talking about the j pouch (http://www.j-pouch.org) where an internal pouch is made from your small intestine and you poop 'normally' via your anus.
Otherwise, he may be talking about a Kock's Pouch or a BCIR (Barnett's Continent Internal Reservoir) (http://www.bcirostomy.com) where you don't have to wear a bag. Instead you catheterise a tiny stoma a few times a day to empty the internal pouch. At all other times, you can cover the stoma with a small bandaid to protect it.
All of these procedures are NOT for those diagnosed with CD. Unfortunately, the Crohns can come back and affect the internal pouch thus necessitating it's removal and the removal of more, needed intestine.
Hope this helps :)
See this link for an explanation of the different types of ostomies available http://www.ostomates.org/ostomies.html
I'm not a complete idiot - some parts are missing!
Ileostomy for 27 years since I was 10 years old, due to UC.