After removing the innodb_additional_mem_pool_size=4M from my.ini and killing that process that used the port that Mysql wanted I managed it to go.
Suggested fix: 1) The quick solution: Comment the line innodb_additional_mem_pool_size=4M in the service's 'my.ini' file, 2) exclude the option from the 5.7.4 default config file or 3) un-unknow the variable to mysql ;)
link: http://bugs.mysql.com/bug.php?id=72533
Use number 1, remove the whole line. Save to my.ini. Kill the process if you have one running (look at them with resmon.exe and kill them with command taskkill /pid pid-of-process /f), then start wampmysql and your icon should turn green.
Regards SB