The space required for new turning loops is indeed large. Two have opened in recent months on the western side of Prague. One is a Dědina, tantalising close to the airport, and which stands on open ground but close to one of Prague's typical residential areas, and which features two tracks. Incidentally, the opening of this extension to routes 20 and 26 has meant that the unusual loop at Divoká Šárka has been reduced to a single track - previously it was double, with trams on the two routes using it in opposite directions. It is not now used in normal service.
Further south, the new loop at Slivenec stands in open fields, a five minute walk away from the village that bears its name, which involves passing under a busy dual-carriageway. The tram in the foreground is at the alighting platform in the first shot, the modern artic in the background was loading prior to departure. The bank seen behind the tram in the second photo is to shield the terminus from a local farmhouse, I believe. There are three tracks here, although only routes 4 and 5 have been extended to use it, and there is a staff rest room just off shot to the right. Each track will easily accommodate two tram workings (each an artic or a pair of T3s as here).
However, two other recent extensions have been to dead-end termini at Pankrác and Libuš, requiring the use of Prague's only class of double-ended tram, the Tatra T8, on routes 19 and roughly 50% of journeys on route 17 respectively. Also, for a few months before the Slivenec loop was completed, route 5 was extended to a temporary terminus at the stop before it, Holyně, which now boasts an unused scissors crossover!
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