Found this interesting list of who is riding what. To be updated at roadracingnews.co.uk.
 
Bruce Anstey Valvoline racing by Padgetts
Ian Hutchinson Paul Bird Motorsport
motorcycles/Mugen (TT zero class)
John McGuinness Honda racing/Mugen (TT zero class/Jackson racing (supersport races)
Phil Harvey Team 98
Colin Stephenson CS racing
Dean Harrison Mar Train racing Yamaha
Dan Kneen Millsport Suzuki
Jamie Coward Horizon Distributon/Barnes racing (supersport races)
Dominic Herbertson Herbertson racing
Daley Mathison Daley Mathison racing
Petre Pop Garage Monsters team
Stefano Bonetti Team Racing RocknRoad
Adrian Harrison Printing roller services
Ben Rea Rea racing/CMS racing
James Cowton Danny Tomlinson racing
Ian Pattinson Weardale racing
James Hillier Quattro Plant Kawasaki
Sam Wilson SJW racing
Alan Bonner The peoples bike team
Ivan Lintin RC Express racing
Jamie Hamilton Burrows Engineering racing
Richard Mcloughlin Auto tech repair centre
Cameron Donald Norton racing
Paul Shoesmith Ice Valley racing
David Hewson Obsession engineering
Frank Gallagher Zest legal
Shaun Anderson Trevor Scott racing (lightweight tt class)/Kingston university (TT zero class)
Gary Johnson GB Moto racing Kawasaki
Andy Lawson Shirlaws motorcycles racing
Derek Mcgee Wilson Craig racing
Robert Wilson Stoddart racing
Ben Wylie Bimota racing
Gareth Keys B&W racing
Dan Kruger Penz 13.com
Guy Martin Tyco BMW
William Dunlop Tyco BMW
Conor Cummins Honda racing/Jackson racing (supersport races)
Dan Stewart Wilcock consulting
Lee Johnston East Coast racing
Michael Russell Club 55 racing
Michael Sweeney
Russ Mountford Silicone engineering racing
Sam West Homer racing
Ryan Farquhar KMR Kawasaki
Connor Behan KMR Kawasaki
  Sidecar TT 2015 entrants
Dave Molyneux/Benjamin Binns
Gordon Shand/Phil Hyde
Ben Birchall/Tom Birchall
Conrad Harrison/Mike Aylott
Sean Hegarty/James Neave Nick Crowe racing
Ian Bell/Carl Bell Ian Bell motorcycles
Tim Reeves/Patrick Farrance
John Holden/Andrew Winkle
Alan Founds/Tom Peters Team Founds racing

Kilbil