Janes has released more info reference the possible C1 configeration, as follows:
"The FSC C1 baseline design suggests a ship 141 m-long and displacing 6,850 tonnes. It will be equipped with a low-frequency active variable depth sonar and two launchers for the Future Local Area Air Defence System (Maritime), firing the Common Anti-air Modular Missile. -
Options include a vertical launch system for Tomahawk or Storm Shadow land-attack missiles, or alternatively a modified M270 guided multiple-launch rocket system. The Harpoon anti-ship missile system is also an option, while the main gun will be a 127 mm, 155 mm or refurbished 4.5 inch (114 mm) Mk 8 mount.
Aviation facilities include a flight deck capable of supporting a Chinook helicopter, a hangar for a Merlin-sized helicopter and a smaller hangar for unmanned aerial vehicles. Type 26 will become the lead platform for unmanned vehicles but will not be responsible for their development and procurement.
Below the flight deck, a mission bay and stern dock will hold four 9 m rigid-hull inflatable boats, the towed array sonar and a surface ship torpedo defence system. Alternative options for the mission bay will be examined as this feature is considered a design driver.
The frigate will have an all-electric propulsion system or a hybrid propulsion drive, giving a range of 7,000 n miles at 18 kt. Early concepts indicate a ship's company of 150 personnel plus an embarked maritime force of 36.
Current assumptions call for the construction of up to 10 Type 26 ships, designed as a versatile combatant to protect expeditionary task forces and provide anti-submarine warfare defence."
Two CAAM launches? One assumes these would be split between the bow (as with T23/45) and possibly amidships or maybe even port and starbard, similar to a Canadian Halifax class, thus leaving the fordeck free for the maingun and TacTom/SCALP (StormShadow) or marinised MLRS Launcher? MLRS would be a much cheaper option than TacTom, but lacks the range. However with the carrying capacity of Astute the RN may not require a Rolls Royce deepstrike capability for the T26. It would make the T26 more exportable if they went for SCALP (Produced in Europe, no US export caveats)
At nearly seven thousand tonnes they are up there with your typical Destroyer!
6 T45, 10 T26 and say another 14 C2/3 would not be a bad mix providing enough protection for the ARG leaving enough free for general fly the flag missions.