all the iphones; ALL can be jailbroken. Even the 1.1.3 OOB
Go to: http://docs.google.com/View?docid=dgzw9xs_0gfhxns&pli=1
And you find a table, see the last column (1.1.3 OOB) Jailbreak - YES !
You can use the new 16Gb as an itouch and wait for a proper activation to be release.