I highly doubt Apple will even move to the Santa Rosa platform. They're not using current Centrino platforms, so why would they use the next one?
Not to mention they already slipped in 802.11n into C2D MBPs.
Just because Apple doesn't slap ugly Centrino stickers on their cases doesn't mean the MacBook and MacBook Pro aren't based off the Centrino platform (Hell, the iMac and Mini qualify, except for them not being laptops).
The Napa Centrino platform contains the following:
The platform consists of:
* an Intel Core (code-named Yonah) or Core 2 processor (code-named Merom)
* an Intel Mobile 945 Express-series chipset (code-named Calistoga), and
* the Intel PRO/Wireless 3945ABG mini-PCIe WiFi adapter (code-named Golan).
Intel uses Centrino Duo branding for laptops with dual-core ("Core Duo") processors and retains the Centrino name for laptops with single core ("Core Solo") processors.
Aside from the Intel PRO/Wireless, The MB, MBP, iMac and Mini meet the criteria for the Napa platform. Intel has allowed vendors to label their products "Centrino" even if they use a wireless chipset other than Intel's, which means every shipping Apple computer except the Mac Pro and XServe qualifies as a Centrino product.
Centrino is really just a marketing term, nothing more.
I don't imagine you'll see a big move to next chipset because there's very little value in it for the MBP. GMA965 isn't going to be used in the MBP, so the only benefit of Santa Rosa is going to be 800Mhz FSB.
Except a faster bus, faster CPUs (Future Merom processors will be Socket P), NAND flash-memory caching, and support for more than 3GB of RAM. It would also make sense for Apple to base all their laptops around the same platform (currently Napa, later Santa Rosa). The MB could use the integrated GMA X3000 graphics; the MBP a discreet solution, likely from ATI or NVidia.