New features coming for Time Capsule and AirPort: the ability to support 802.11b/g devices while also broadcasting 802.11n wide signals at the same time, according to Apple Insider.

Currently, existing models can only run in b/g support mode at 2.4GHz or n wide signal mode (5GHz) at one time, providing either a large range of compatibility or high network performance. But FCC filings seem to suggest that the new Apple products will have a "combined mode" for running both. This probably means they'll do what makers like Linksys have been doing for a long time, that is use two antennas. [Apple Insider]