recently i have going through the whole story of halo so far and what i have noticed is that i could not find a single thing on the rookie after halo 3 ODST, i did learn of his past i believe in some videos but nothing after this event so if anyone does no what happens to him please mention it! i would really like to know what happens to him or will he be in any future halo games? I hope there is!
Well there is nothing about the Squad after ODST.
But if you were interested there are some story’s and other places that explore the Squads adventures if you will before the game in chronological order. Sorry if you seem some of these already. But they are interesting regardless. 
Halo Legends The Babysitter features Dutch on a mission to assassinate a Prophet
Halo Evolutions there is a Story called Dirt that features the Rookie and how he survived the Battle of New Jerusalem.
Halo Helljumper goes though the Battle of Ariel and has both Dutch and Romeo
More obvious is Bucks appearance in Halo Reach. And a mission he had on Reach
http://cdn.haloodst.xbox.com/odst/index.html
The link above has the interviews(the interviewer being Buck), for Mickey, Dutch, and Romeo.
And this the project page on Bungie.Net. The field guide has info about the characters. And other aspects of Halo ODST.
This is everything of major interest to other than stuff in visual guides, and the Halo encyclopedia.
I’m sorry, I hate to sound like a nerd or correcting brat, but the thing with Buck in Halo Reach was before the ODST story.
> I’m sorry, I hate to sound like a nerd or correcting brat, but the thing with Buck in Halo Reach was before the ODST story.
I did say before the game of Halo ODST