An updated version of the Raspberry Pi Model B has launched, and this new “Plus” version offers a number of upgrades. The official name is the Raspberry Pi 3 Model B+ and it is on sale now for the same $35 price as the previous version of the developer board. 

Updates include:

A 1.4GHz 64-bit quad-core ARM Cortex-A53 CPU
Dual-band 802.11ac

Source: Hot Hardware – New Raspberry Pi 3 Model B+ Packs 1.4GHz Processor, 802.11ac, And GbE