The packaging style used on the WRTP54G and RTP300 is also being used on two other routers I found. The WAG354G Wireless-G ADSL Home Gateway appears to be a Europe-only offering right now and combines an ADSL2+ Modem, router, 4-port switch and 802.11g wireless AP.
WAG354G Wireless-G ADSL Home Gateway
What does look to be now available in the U.S. is the RT042 Broadband Router with QoS. The RT042 is a four-port, dual-WAN router that includes abilities to set maximum and minimum bandwidth per user and also by application. Reporting capabilities include each user's top 10 visited websites and bandwidth used by application. It also includes other built-in parental controls. Street pricing starts around $81.
RT042 Broadband Router with QoS
Perhaps to counter NETGEAR's recent announcement of an AP version of its RangeMax router, Linksys appears to be readying an AP version of its WRT54GX router based on Airgo Networks' True MIMO chipset. The WAP54GX also sports a more robust (and upgradable) tri-antenna design using RP-SMA antenna connectors.
WAP54GX SRX / True MIMO Access Point
According to Linksysinfo.org, the new design is also being rolled into the WRT54GX router and is already showing up in stores. This change should address user complaints of antennas breaking on the original design.
Linksysinfo.org also has details on a number of other new and refreshed Linksys wireless products, including the WMP54GX SRX / True MIMO PCI Card and WTR54GS Wireless G Travel Router with SpeedBooster. Both of these products pop up in a number of on-line retailers so should appear within a few weeks. Street for the WTR54GS starts around $80 and around $100 for the WMP54GX.