Not sure if this has been posted yet, but it sounds good. Longer platforms and improved signalling meaning more trains. (Although there will obviously be disruption whilst the work is carried out)
http://www.theargus.co.uk/news/10549213.Brighton_to_Lewes_train_line_upgrade_delights_Seagulls_supporters/
http://www.theargus.co.uk/news/10549213.Brighton_to_Lewes_train_line_upgrade_delights_Seagulls_supporters/