I havent heard anything official from the company but this does sound logical.
KLMuk is fleet common with KLMcityhopper (F50, F100/F70) to combine the two would be a huge saving in admin / aoc costs.
Buzz needs to expand, KLM needs low cost at AMS to compete with Easyjet, the Buzz brand is doing well in europe, so it again it is logical to combine Transavia and Buzz and take on Easy.
Running so many AOC's (KLMrda, KLMuk, KLMcityhopper, Transavia, Martinair) is a very expensive business, to reduce to three AOC's is the way foward.