That's no different from concept art for new locations, armour etc. Look at the concept art for those yeti's that were for that quest added around December last year, look at the concept art for I don't know.. elite dungeons - anything, it never looks that good.
Hell, hardly any games that aren't restricted by what RS is even look that good. The only times they do is when they're heavily modded but by that point it's already exceeding the standard that the majority can run/support with the machines they own, so developers don't cross that line.
DongáUáDeadsaid: This is what I would like to see in-game.
I've lost count on how many times I've said that in response to concept art Jagex has put out, e.g. how detailed the drakewing outfit looked in the concept art but was completely butchered when added to the game.
Even if it was, I hope Jagex doesn't waste time and money on it; they'll never be able to compete with other games in terms of pretty graphics, so they should instead stick to one art style and keep it consistent. Gameplay matters a lot more in Runescape.
"As for forktails, bait them thusly: pound a stake in the soil, bind a goat to it, then hide ye in nearto shrubbery posthaste."