IBM just announced Lotus Notes ActiveSync support will be released later this year. The code is already live, and was demonstrated in a seminar earlier today at Lotusphere.
This is native integration with the iPhone–within the native mail, calendar, and contacts. Previously, iPhone users were forced to use the mobile Safari browser to access the Notes Web Access interface.
Lotus is playing catchup with Microsoft, who released push e-mail for Microsoft Exchange in March 2008.
No news yet on Android support, though Ed Brill, IBM Director of Messaging, said few customers are requesting Android support. Similarly, nothing was said about supporting the new Palm Pre platform.