There are numerous takes on this type of game, which did not originate with Bob, as I understand it, but he is perhaps the most vocal advocate, currently.
A few other notable chaps are pushing the concept into new and interesting directions, using technology to advance the standard, so to speak.
I would not be surprised to see someone doing "official" resin or laser cut plywood tiles and terrain, to support those of us who see the utility of this type of game. Yes, it is rather stylistic and lacks the glamour and glitz of other game systems, but its simplicity is an attraction all to itself. Also, it is, well, portable.
Of course, the Perry's have already developed a similar game, which is also very portable, by design.
The flexibility of the game means that one could play any genre, be it science fiction, fantasy, historical, or whatever lies between. Also, the game itself could be of any size or scale, from 3mm to 54mm figures and the size of the board/table could be a chessboard (or even smaller) to a very large multi-table board. Your only limit is your imagination...and space...and budget. But, these are minor when compared to the benefits of having a game ready to hand wherever you live and wherever you go.
There's a lot of action or potential action in the above photo. Is the terrain super-realistic? Why does that matter? Do it really matter at all?
Heck, as the image below shows us, we don't even need miniature figures at all.
One of my current not-quite-backburner projects is to create a 10x10 square board, and assemble two WWII-ish armies. I am looking at Russian and German miniatures, but painted as Mordian and Cadian troops from Warhammer 40k. I've just ordered a small selection of Pendraken 10mm figures, including an AT gun, a tank, and some infantry, to get a sense of the size of square I will need for my board. Now, I can use my Kallistra hexes, but they are not as readily portable and I dare not risk them as baggage on a flight across the country.
Another bonus, I figure solo rules for this type of game will work just fine.