One of the biggest changes are the new unit cards. Below is the MERCS 1.0 unit card for the KemVar Heavy Assault, followed by it's MERCS 2.0 successor.
Firstly, there is now information on both the front AND back of the cards.
All the basic unit information is on the front, with more detailed information on that back - very handy.
Secondly, the indentations in the cards, which were used for movement, have been removed.
Movement in MERCS 2.0 can be now be done using tape-measures, as well as using the new template card - which will be included in each deck, pictured below. The new template cards will have the Megacon's Corporate Traits listed on them as well.
Each unit in MERCS will also have a page dedicated to them in rulebook. Pictured below is the CCC Incinerator unit card, followed by the corresponding page in the rulebook.
Another addition are the new punch-board tokens, which will be shrink-wrapped along with the MERCS 2.0 tabletop hard-cover rulebook. The picture below shows which tokens are included, and the movement template is hard to miss.
I'm not sure if this is a Kickstarter exclusive, or if it will come with all MERCS 2.0 tabletop rulebooks purchased via retail.