Liberty versions 4.5a and newer include an updated Vantiv Payments Integration that is compatible with a new generation of EMV-ready hardware. (Liberty version 4.5d is required to actually process true EMV transactions through Vantiv.) This new Vantiv integration supports the Verifone VX805 device.
The Verifone VX805, which lacks signature capturing capabilities, does offer several nice features that older Mercury compatible hardware was not capable of - such as an NFC reader for ApplePay and Google Wallet transactions.
We're currently waiting for some changes to take place at Vantiv, which will open up compatibility for several new devices - most notably, the Verifone MX915, which is a beautiful Signature Capture device. The new devices will be available from Vantiv as either USB, or as Ethernet - which can be used for Liberty Cloud customers.