As far as I could tell, the lenses for the current Sky system are very much like polaroid sunglasses, just that each lens is polarised perpendicularly to the other. So everything is just a little darker than usual.
Sky don't have a chosen display system - beware of assuming "Sky system" is polarised glasses based because the pub screens are. That isn't a conclusion to jump to.
Sky are using a TRANSMISSION system called "side by side" - mainly because it is the only system that delivers 50Hz motion AND is compatible with 4:2:0 subsampled H264 transmission (i.e existing Sky HD boxes). If you tune to channel 217 on a Sky HD box you see the left and right eye feeds 50% subsampled horizontally (i.e. 2x 960x1080/50i streams next to each other) 4:2:0 chroma subsampling causes problems for transmission using chequerboard and alternate line standards I believe, though top/bottom could be used?
However this is just the TRANSMISSION system.
How a TV DISPLAYS this stream is entirely a function of the TV - and nothing to do with the transmission system Sky are using.
All a TV has to do is recognise (or be told) that it is receiving a side by side feed - and then display it in a way that works with its chosen 3D technology.
For polarised pub screens, they do this by stretching the 960x1080 left and right eye feeds to 1920x1080, but then sending only 540 lines of the left and right eye feeds to alternative lines on the 1080 line display (i.e. discarding half the lines of each eye - though they probably filter to avoid aliasing), with each alternate line polarised alternately so that the left eye sees one set of lines, the right eye the other set of lines. This delivers 960x540 resolution (though with fast motion in 50i this vertical resolution reduction isn't so huge, however with 25p movies it is much more significant), but both eyes see a picture at the same time. The polarisation filtering also dims the image (as some light is being blocked)
For active shutter domestic displays, they do this by stretching the 2 x 960x1080/50i stream back to 2 x 1920x1080/50i and then de-interlacing to 2 x 1920x1080/50p, and then outputting these as a single 1920x1080/100p or 200p stream. An infra red signal is sent from the TV to active shuttered glasses that you wear, to synchronise them to the 100/200Hz frame sequence, allowing the left and right eyes to be blanked for alternate frames. Thus the eye gets a full 960x1080 resolution image - but you don't get both eyes seeing a picture at the same time.
Polarised screens are more expensive to manufacture - as there is an extra process in production compared to 2D displays, and they have reduced resolution in 3D. (Particularly an issue for Blu-ray which uses full 2 x 1920x1080/24p resolution) However the passive glasses are cheap and can be effectively disposable.
Shuttered systems need no more manufactuing processes to be added to the screen - 100/200/400Hz screens are being manufactured for 2D. The only additional requirement for the display is some processing (probably almost zero cost after development has paid off) and the IR emitter (which could be optional) It also offers full 1920x1080 resolution to each eye. However the glasses are active (need batteries or charging) and much more expensive than passive polarised glases.
So polarised with passive glasses are good for mass viewing - like pubs (and cinemas) Active shuttered are possibly better for the home, as adding compatibility with 3D can add very little to the cost of set manufacture - instead the glasses add the cost. However the shuttered system can be an upgrade you could do at a later date (with 3D Ready being a possiblity)
Sky is compatible with both systems - they are display-agnostic...