I don't see concrete evidence of a buy out but this contract (and perhaps others) is surely what management had in mind when deciding to issue shares in the future to pay for the WM acquisition. I will note that the amount of the contract with CAT isn't described at all. That perhaps could be good (ongoing and therefore undefinable) or not so a good (a foot in the door trial).
I will say, after 20 years of being in the market, that I wouldn't evaluate any company on whether it is about to be bought out. Not a great basis for an investment decision. Look at it like Buffet says--is this a company you actually would want to own/work at/be a part of? To me the answer for CAMP is clearly yes. Take a long term approach, sit back and enjoy the ride. I think it's going to be a good one.