Well no zombies so I don't see much in common except that it takes place on a "reality show" set. I think it looks interesting a bit more dramatic than "Dead Set".

Nice, I will definitely watch this when it comes out!

Everything about it can be found here in Croatian:
http://www.tportal.hr/showtime/film/54098/Reality-apokalipsa-u-novom-hrvatskom-filmu.html

In short let me translate the part about the plot:
"The story follows ambitious and successful producer 40-year old Filip Dogan, who is producing in Zagreb 10 years in the future since now a reality show "Housed".
the show in its form and context is very similar to The Big Brother, but "Housed" lasts for 180 days, where 6 couples in love live together in a house built for the occasion.
The plot begins when during the show the world war begins on the outside, which in short time envelops the entire Europe and turns it into a battlefield. Filip Dogan focuses all his efforts to keep the contestants in the dark about the truth of the outside world and happenings, in the beginning out of sheer show rate mongering, and after out of emotional bond with the contestants and compassion for them.

The directors says also that The Show must go on is in essence a drama about social and interpersonal relations, where all other elements such as war serve as backdrop for it.
The script was written in 2003, thus preceding The Dead set and is very similar to Emir Kusturica's - Underground, but still remains "original" as much as a script can be.

Was announced postprod in Pula last year:
http://www.pulafilmfestival.hr/downloads/bilten9_1.pdf
http://www.pulafilmfestival.hr/downloads/nacionalni.pdf

at the bottom you can find the info and some clips about the first post apoc Croatian movie - Vektor:
http://www.tportal.hr/showtime/film/53139/Snima-se-prvi-hrvatski-postapokalipticni-film.html

I think we discussed it here, but if not
there it is.