It remains to be seen. Google has said that they will "whitelist" certain developers to continue using CalDAV which is what iCal uses to sync both the Mac & iPh

It remains to be seen. Google has said that they will "whitelist" certain developers to continue using CalDAV which is what iCal uses to sync both the Mac & iPhone. One would hope/expect that Apple will be one of those developers. No one from either company has commented or confirmed it either way. It's a major reason why people are so surprised and incredulous about Google moving away from the standard.