Any source of this "big" annoucement in 10 days?
A320 - unlikely to be a full blown takeover by a company whose shares are listed on a stock exchange - there's a ton of regulation around companies having to be transparent to investors as a whole and preventing false markets / insider dealing and other forms of abuse. If there is to be a takeover with an announcement in 10 days time, investor speculation will likely force an announcement or at least disclosure of merger talks to be made earlier.
Wizzair are not on the stock market, they indefinitely postponed their IPO on the London Stock Exchange in June this year...
http://www.ft.com/cms/s/0/f654e03c-f...#axzz3KpMIK2wt
Their ownership is not all that clear and a bit of a mystery, they are considered a private company, and think they are owned by one of these private equity companies.