The 20706 and 20719 based module can support 2 central and 2 peripheral connection simultaneously. LE maximum connections are limited to the amount of memory available. Please have a look at this thread and may have some help.
The EZ-Serial doesn't support it. You need to develop your own firmware. The following blog is a central with multi peripheral:
Just wanted to add in Owen's response that our BLE Module based on PSoC 6 Platform can also support up to 4 concurrent LL connections.
Here is the Module datasheet- http://www.cypress.com/documentation/datasheets/cyble-416045-02-ez-ble-creator-module