DVD deltaisos for Fedora 13 TC1 -> TC2 (i386 and x86_64) are now available at
http://thepiratebay.org/user/andre14965/
i386: Fraction of full ISO size: 5.1% applydeltaiso's approximate running time: 6 minutes
x86_64: Fraction of full ISO size: 3.6% applydeltaiso's approximate running time: 7 minutes
Using these requires a box running Fedora 11 or later (Fedora 10 or below will NOT work due to the lack of xz support in the deltarpm package), the updated deltarpm package (currently version 3.5), and if running Fedora 12 or later, the deltaiso package. Detailed instructions are at the above link.