i have tried to catch up as much as i can on the issues that people are having and can sympathise with the majority of them.
in answer to your questions:
Access to Honor Oak Park station - Southern will not be implementing any works on the station to make it DDA compliant - mainly because the station goes over to LOROL and he east london line in september. LOROL and TFL will then be responsible for implementing these changes. The Only station im aware of on my patch (London Bridge to Anerley) that has access works planned is Forest Hill which is in the early stages of planning for lifts - again no dates though and i stress this is the early stages.
Train carriage shortages - this is a major issue on the whole line and one that at the moment is not easily solvable. We have recently struggled with our general train running performance and during incidents such as the fatalities at Balham, Thornton Heath and Whyteleafe train stock has become displaced and therefore, unfortunatly, been unavailable the following morning. i can only apologise for this. Under new franchise agreements i am lead to believe the majority of platforms in the london area will have to be extended to 12 coaches long but we will have to wait and see if this means additional coaches or not. The other factor is that Southern is using all the available stock it has which currently isnt quite enough. as i have mentioned this problem is known about at every level of the company but we are still waiting on a solution.
LOROL take over the east london line in september and that is when the tickets offices and platform staff at New Cross Gate down to West Croydon and Crystal Palace no longer work for Southern. For the first year Southern will continue to run services at all of these stations under the summer timetable which will be released later this year. The East London Line itself will be strange up until late 2010 as in fact they dont actually have any stock to run on it. im sure more information will be made available in the coming months but at the moment i am in the same position as you - just waiting for the consultation meetings.