Per the listing on iTunes:

What's New in Version 4.2.0
The Hennessey Venom GT comes to Real Racing 3! Strap in, take the wheel and hit a world record-shattering 0-to-186 miles per hour in less than 14 seconds! Can you handle the Venom?

• Experience the raw power of three new cars!
o Hennessey Venom GT
o 2015 BMW 3.0 CSL Hommage R
o 1975 BMW 3.0 CSL
• Take on the all-new Front Runner special event for your chance to win the Hennessey Venom GT, the fastest accelerating production car in the world according to Guinness!
• Show that you have the skills to bring home both the classic 1975 BMW 3.0 CSL and the new 2015 BMW 3.0 CSL Hommage R!
• The Gauntlet returns for the fifth season with thousands of new randomized racing challenges plus more chances to win R$ and Gold!