As this is going to be best use case for remote devices without human intervention, battery life or power source will play significant role in this. so as it's using LTE how power consumption is going to be (for places with less availability of electricity) any future plans for solar integration?

We’re actually looking at a few energy harvesting ICs designed for solar. They usually charge up an onboard super capacitor that can be used for infrequent transmissions. If it works out, we might add it into a future version of the board, or as an add on board

They mention it is battery ready, small solar panels w/ battery charge controllers are very plentiful in the market today. If this is anything like competitors (Particle), you can put the devices in a very low power sleep state and have them wake up on event or on a time schedule to connect to LTE and send data.