Recently Arduino has announced several new microcontrollers. The MKR WiFi 1010 and the MKR NB 1500 both have the same long skinny form factor as the Arduino MKR1000
Two more boards were recently announced at the Maker Faire in San Mateo. The Uno WiFi Rev 2 (shown here) and the MKR VIDOR 4000. The Uno WiFi Rev 2 uses a new ATmega4809 chip and has 6KB of RAM. The MKR VIDOR 4000 is based on a FPGA chip.
All 4 boards will be available sometime in June.