Based on the new M4 version of the Nordic chip the BluChipM4 has dramatically increased capabilities over the standard BluChip.  

The BluChipM4 upgrades the following

• 64Mhz processor (from 16Mhz)
• 64k RAM (from 32k)
• -96 dBm RX sensitivity (from -93)
• 512kB flash (from 256 kB)
• 12-bit ADC (from 10-bit)
• 5.5mA RX/TX power consumption (from ~9mA)
• Floating Point Support