well the rumours are about gatwick as to airline terminal movements and security arrangements.
easyjet to split operations between the north and south terminal with former gb airways routes in north. thomsonfly/thomas cook airlines/qatar airways to move from south to north.
also, some airline may be moving to different zones within each terminals.
with regards to security with one bag rule - apparently south terminal both central search and flight connections can take more than one bag where as over in the north, from the 11th of this month passengers will be able to take more than one bag at flight connections but will be one bag only at central search.