As others have said, Number 2, "What is it?", is preferable. As you have just given its name, "it" logically refers back to the thing you named. We usually say "What is that?" when referring to something that we are pointing at, rather than something we have just identified.
You could also simply say "What is Webbum Globbler?", but I'm assuming you like the "X - what is ..." form.
Numbers 3 and 4 would be considered at least mildly offensive to many people. Use of profanities should generally be avoided in a business presentation. In my humble opinion, people today are much too free with profanities. I read something by a film critic recently where he asked, "When was the last time you heard someone say, That could have been a good movie, but they just didn't use the F-word enough?" The point being that plenty of people would say the reverse, that an otherwise good movie was made offensive or at least distasteful by too much profanity, but few would complain that there was not enough. People sometimes use profanity for shock value, to get attention, but when everybody does it all the time, the effectiveness of the technique is worn out.
In any case, number 3 is grammatically incorrect. We do not say "what to hell" but "what the hell". Maybe that was just a typo.