Hi
Well there are two official training courses for the VCAP5-DCA:
As for videos i'm sure there will be but i haven't seen any official mention. Although seeing as the exam is going to be about 70% the same as the VCAP4-DCA you can use all the VCAP4 videos out there:
I've done a breakdown of the VCAP5-DCA blueprint if your interested:
http://thesaffageek.co.uk/2012/04/16/vcap5-dca-beta/
You can also use the vSphere 5 trainsignal videos to fill the gaps from vSphere 4 to 5
http://www.trainsignal.com/VMware-vSphere-5-Training.aspx
Gregg