exchange 2013 in exch 2010 environment

Running first exchange 2013 multi-role server in my environment which also has exchange 2010 mailbox servers.
Can a DAG comprise a mix of exchange 2010 and exchange 2013 servers?

ISA server 2006 is currently publishing my exchange 2010 CAS servers. - outlook anywhere, activesync, owa.
Can it also publish exchange 2013 CAS ?

---

Anand_N