Not a surprise. I've heard that readers have been installed already. In fact the surprise is that it didn't happen at the same time as Dartford.
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Well, absolutely no information on either TfL or Southeastern websites, but both customer service teams confirm that it is happening. Interestingly the TVM at Swanley has already been upgraded to sell the cheaper zone 1-8 period travelcards and zone 1-9 day travelcards. Wednesday is an odd day to start something too, but I guess it avoids the Monday morning crush.
The info about Swanley and Oyster has now emerged.
https://tfl.gov.uk/info-for/media/press-releases/2016/march/pay-as-you-go-travel-with-contactless-and-oyster-extends-to-swanley
Thousands of rail passengers in north Kent are set for cheaper fares and more convenient journeys from Wednesday 9 March as pay as you go with contactless and Oyster is extended to Southeastern and Thameslink services to and from Swanley.
Pay as you go fares are cheaper than paper tickets and are the same regardless whether you use a contactless payment or an Oyster card. As part of the introduction, Swanley will also move into the London zones for the first time, allowing customers to now use a Zone 1-8 Travelcard to complete their journey.