See release notes at SMPP Router - 1aa592e.
MSISDN lookup support for a major query provider has been added. Enables routing based on actual network to which a mobile number currently belongs.
Least-cost routing has been added for ESME configurations. Cost information can be associated with networks for each target set. SMPP Router will identify the least-cost target set for a given ESME and network, and will route message to that target set.
Read more in Routing documentation section.