The Gen 3 will likely be all electric - no gas engine back up. An anticipated advance in battery technology by then should give it at least the same range as the Bolt has now which is about 238 miles. It will compliment the Bolt since it will be a somewhat larger car. It will be a complete new design over the Gen 2, of course. Weight will be reduced slightly - maybe a couple hundred pounds. There will be no gas engine to haul around but there will be additional battery weight to factor in.
The current Volt power train in some variation will live on in the larger GM vehicles. It could live on for some time if more advanced battery technology is slow to develop and gas remains relatively cheap.
The Gen 2 power train has some advantages with two types "fuel" to pick from in a pitch. If that is your preference, plan on getting one and keep in my mind my final prediction - the Gen 2 may be replaced sooner then expected.
The current Volt power train in some variation will live on in the larger GM vehicles. It could live on for some time if more advanced battery technology is slow to develop and gas remains relatively cheap.
The Gen 2 power train has some advantages with two types "fuel" to pick from in a pitch. If that is your preference, plan on getting one and keep in my mind my final prediction - the Gen 2 may be replaced sooner then expected.