We had a pretty decent Safari Zone in R/S/E, with the ability to catch Pokemon of certain natures through the PokeBlock feeder, areas that required a certain bike to get to which gave you something to discover even if you've been there a couple times, and a nifty expansion in Emerald.
However, we've had some new features tied to later Safari Zones as well. Johto you could basically mix and match your own Safari Zone, while X and Y gave us Friend Safaris.
So, what would you like to see in ORAS? Hoenn style? Something completely different?
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I personally want something sprawling and epic. Something big enough that I'll have to buy more steps or Safari Balls halfway through to make it through all of it. They could accomplish this with expansions to the vanilla R/S/E Safari Zone as the plot moves on, and/or use postgame sidequests to unlock more. I'm meh about the PokeBlock feeder returning, and I'd rather throw generic bait then have to waste PokeBlocks on Pokemon that might not like them. I'd also like the Friend Safari to return in some form, but with different Pokemon setups assigned to the friend codes, for variety. They could place it on one of the unexplorable islands.
I would like the
Emerald Safari Zone layout (including the post-League expansion that contains more Johto Pokemon), as well as any Pokemon that were present in the
Ruby/Sapphire Safari Zone. I'm not sure whether Altering Cave (which is e-Reader dependent and normally is just full of Zubat only) will return; if it doesn't, a Safari Zone expansion could be made to contain (and possibly randomize itself each time you enter the Safari Zone, to reference the e-Reader cards) the intended Pokemon for
Emerald's Altering Cave. And if not elsewhere in Hoenn, the Safari Zone can have more space for a few Sinnoh, Unova, and Kalos Pokemon, too.
I wold definitely like to see the Hoenn/Kanto style Safari Zone. I don't think it should be massive, though. The entire Hoenn region serves that purpose. I don't want PokéBlocks to return but I think that they, or a similar replacement, will return. As long as Wobbuffet is still available in the Safari Zone, I'll be fine :P
The overworld Pokeblock feeder things (since certain Natures like certain PokeBlocks) would work well in tandem in Synchronize (used to force encounters with wild Pokemon of a specific Nature), since if the "Synchronize" effect fails (of which there is a 50% chance), the "Pokeblock feeder" could be used to still give you a potential chance to encounter a wild Pokemon with the Nature that you want. It occasionally sucked to waste Pokeblocks in battle, but I think they would help greatly during battle if you were searching for specific-Natured Pokemon and fed it an enthralling PokeBlock.
If possible, there could also be a small patch in the Safari Zone that works identically to Kalos' Friend Safari (especially as how Secret Bases are going to be encouraging multiplayer connectivity anyways..).
Oh, and the music needs to stay the same; it really fits the spirit of an actual "animal safari"!