CRM 2013 rollup one is available now!! (watch this space for any CRM 2013 related downloads)

CRM 2013 on-premise installer:
CRM 2013 On premise Source file

CRM 2013 Roll-up 1 is available for download:
CRM 2013 Roll-up 1

CRM 2013 Latest SDK download:
CRM 2013 SDK