With thanks to Andy Kent I'm now able to provide photgraphs of the lastest commissioned models released by the LT Museum earlier this week. A limited quantity of the gold RT models were indeed available from the Museum at the public openeing on the 30th March.
Supplies of the green RML meanwhile are said to be plentiful at present.

10131C - AEC RT Bus - London Transport Museum's New Shop


31904 - Long Routemaster RML bus - London Transport route 409

        The following models have now been released by EFE and should be available from all the normal outlets.
32601  AEC Mark V 4 Axle Oval Tanker Truck - Milk Marketing Board
26320  Guy Arab II Utility Double Deck Bus - Southdown Motor Services (route 13B)
15806  Leyland Titan PD1 Lowbridge - Western SMT
32203  Bristol RELH Coach - Crosville (traditional coach livery)

        The following models have been released by the LT Museum and were available at a private shop re-opening function. The green RML will be available at the public re-opening of the shop on Friday 30th March. It's not clear at present whether any of the Gold RTs will be made available to the public however.
10131C  AEC RT Double Deck Bus - London Transport Museum - Gold - Route 1
31904     AEC RML Double Deck Bus (Re-tooled) - London Transport - Green - Route 409

        The following models are due for release during the week ending 31 March. The tanker is the first release of the new AEC mark V cab.
32601  AEC Mark V 4 Axle Oval Tanker Truck - Milk Marketing Board
26320  Guy Arab II Utility Double Deck Bus - Southdown Motor Services (route 13B)
15806  Leyland Titan PD1 Lowbridge - Western SMT
32203  Bristol RELH Coach - Crosville (traditional coach livery)

This coming weekend will see a special event held at London's Victoria Coach Station to mark the 75th Anniversary of its opening. A selection of some of the classic coach types which have used the location over the past years will be passing through the Station on the 10th & 11th March. Additionally its believed a number of sales stands are to be present in and around the building.
London's Transport Museum has commissioned some special merchandise which will be available at the event, today the Museum has confirmed to me that this will include two specially re-worked EFE models.

99701 - Standerwick Leyland Atlantean Coach
99703 - United Bristol REMH Plaxton Panorama Elite
Both models have London destinations and new fleet numbers & registrations and appear to be re-worked versions of 16523 and 29502.
Its believed the unusual 997xx catalogue numbers may be the result of an aborted plan to originally release these models in sleeved sets.

The models will be available at the event for £24.99 each, if any stock remains after the weekend this will be available from the new shop in the main Covent Garden Museum building from the 30th March.
Thanks are extended to the LT Museum & Robert, who originally alerted me to these models, for their help in compiling this news item.
Further details about what's being planned for the event can be found on Classic Buses Website.

Another New London Bus Casting Announced
        EFE have announced they are working on a new model of a pre-war London Transport STD. 100 Leyland TD4 double deck buses of this type were delivered to London Transport in 1937 and carried bodies similar in style to those fitted to the existing EFE STL model.
Most of the buses spent the majority of their working lives operating routes out of Hendon depot although later in life some were transferred to other depots including Enfield & Victoria.

Some very early concept versions of the STD model were shown by EFE today at the Acton Depot Open Day. All the models displayed were based on what appered to be pre-production STL models but with the addition of a new Leyland radiators.
A further selection of larger pictures of the STD & re-tooled RT's can be found HERE.

A very early concept model of the STD was shown by EFE at the Acton Depot Open Day.
Picture courtesy of http://www.worldwidemodelbuses.com

Early pre-production version of the RT2
Picture courtesy of http://www.worldwidemodelbuses.com