John Sullivan and John Mountney make up the 16 announced so far, including Keith Ward (not Mark Ward as above)
Stephen Kenny has said he intends to sign 3 TBC's - goalkeeper, another striker and probably a left sided attacking player :
http://www.dundalkfc.com/stephen-kenny-qa-part-2/
Of the 3 youth players he mentions (Fergal McMahon, Sami Osobe and Conor McDonald) Chippy McDonald has already made a number of first team appearences and even got a couple of 'man of the match' awards.
Most Dundalk supporters would like to see an extra experienced centre half (the 4th TBC!), but it does not seem likely