My Questar 3.5 on its tristand is one of my most beloved possessions and also one of my most used (after all, isn't that the definition of a great scope - the one you use the most?). But it isn't my only scope because there are things it cannot do well.
So the notion of a Q 5 is a little disappointing to me. Are we really hoping for a higher quality Meade ETX 125?
When the Questar first came out a half century ago, it absolutely blew away everything else common at the time - long focus small achromatic refractors and 8" f/6 reflectors on awkward mounts. Most people were looking at the moon, planets, double stars and the occasional Messier object. The Maksutov was the ultimate solution to making a world class telescope more portable and high performance than anything else.
But look at the state of the art today. DSOs are the important objects. While Questar images of deep sky objects are interesting, do they really compare to the expansive images most people are getting with an 80 mm apochromatic refractor? And visually, isn't a low power (30x) view with an 80-100 degree field of view more impressive than a 50 degree field of view at 50x?
To me, the core of Questar is quality, not the fact that it's a Mak. The worst part of most astrophotography setups is all the cables going everywhere and the seemingly dozens of adapters that one needs to get everything working together. Questar setups are no different, especially with the hang-on-side declination drive and new hand controller (how many cables are going to come out of that?) I think of the personal computers of the 1990's with all their various graphics cards, sound cards, serial and parallel cables, RAID arrays, etc.
Questar needs to make the equivalent of a Macbook. Sleek design, no adapters needed. Imagine a telescope in one airline transportable case, alt azimuth with a field rotator so you can image without carrying counterweights for the mount. The control box module is between the optical tube a bayonet-mount imaging module, so you can visually enjoy a view and then photograph it. 80 mm f/5 apochromatic refractor offering 3, 7 and 16 mm eyepiece with a 80-100 degree view. A camera capable of 30 fps and 20 mm diagonal imaging area. The lens cap would double as a flat field diffuser. Control is wireless to a laptop. No exposed cords. No t- s- M-whatever adapters. The outer shell of the case doubles as a stool. The tripod has batteries in its legs. No visible wires. Carbon fiber and machined metal. That would be the 2017 version of a 1950s innovation. New technology would translate into new modules.
So a Questar 5 that is merely an enlarged Q3.5, even with goto, isn't really innovative or appealing, in fact it is yesterday's solution to an application far different than the one it addressed decades ago.