According to NME.com Tomson was treated for head and neck injuries at Royal London Hospital but was given a clean bill of health. Here's an official statement from their publicist:

"Vampire Weekend's Chris Tomson was the victim of a hit and run accident last night while walking in London.  He has since been released from the hospital and declared 100% fit, despite some bangs and bruises. The band was in the UK for some shows and promo and will be returning to the US this weekend."

The band canceled a performance scheduled for tonight at Rough Trade in London, a wise move, but will continue on as planned. VW's upcoming North American dates, which includes a stop at Coachella are listed below:

2-29 London, England - Rough Trade East (in-store)
3-05 Orlando, FL - Park Avenue (in-store)
3-06 Orlando, FL - The Social
3-07 South Florida Everglades, FL - Big Cypress Seminole Indian Reservation (Langerado)
3-08 St. Augustine, FL - Cafe Eleven
3-09 Atlanta, GA - The Earl
3-10 Birmingham, AL - The Bottletree
3-11 New Orleans, LA - Pocket Park
3-14 Austin, TX - Antone's (SXSW)
3-19 San Diego, CA - The Casbah
3-20 Los Angeles, CA - El Rey
3-22 San Francisco, CA - The Independent
3-23 San Francisco, CA - Rickshaw Shop
3-25 Portland, OR - Doug Fir Lounge
3-26 Seattle, WA - Neumos
3-27 Vancouver, British Columbia - Richard's on Richards
3-29 Missoula, MT - Badlander
3-30 Boise, ID - Neurolux
3-31 Salt Lake City, UT - Kilby Court
4-01 Denver, CO - Bluebird Theater
4-03 Minneapolis, MN - Triple Rock Social Club
4-04 Madison, WI - High Noon
4-05 Milwaukee, WI - Turner Hall
4-06 Chicago, IL - Metro
4-11 Providence, RI - Brown University Campus Green
4-25 Indio, CA - Empire Polo Field (Coachella)
5-01 Bristol, England - Bristol Bierkeller
5-02 Birmingham, England - Birmingham Academy
5-03 Edinburgh, Scotland - Liquid Rooms
5-04 Glasgow, Scotland - Oran Mor
5-06 Newcastle, England - Northumbria University
5-07 Leeds, England - Cockpit
5-08 Manchester, England - Academy 2
5-09-11 Rye, England - Butlins Holiday Centre (ATP vs. Pitchfork)
5-12 Portsmouth, England - Wedgewood Rooms
5-13 London, England - Electric Ballroom
5-16 Brighton, England - Great Escape Festival
5-29 to 31 Barcelona, Spain - Parc del Fòrum (Primavera Sound)
6-12 Manchester, TN - Bonnaroo