Re: How will Serena prepare for Wimbledon?
Serena has done the same thing for the longest time:
Go home to Florida and practice on hard courts to get the strokes grooved (you don't want to try and groove your strokes to a grass bounce. That throws the timing off.)
Go to England around what...the Wednesday before. Get some practice in at the facility and then play her first round match.
Maria used to play a grass warm up and stopped after 2007. The season is too short to really make a big difference. The girls with big game always do well at Wimbledon. Plus, the grass plays a little more like a slick hard court now anyway.
Serena , Venus , Petra , Ana 
Simona, Vika , Angie, Sveta, Garbiñe
Kim , Mahree , Monica , Dokic, Sandrine, Jie