Usually it takes about 2 weeks between Mojang releasing a new Minecraft version and Bukkit updating to something that's semi-stable.

Fortunately for you guys we're not running Bukkit on our servers anymore. So what I've done is enable 1.5 snapshot protocol on our servers so you can connect to them with the new 1.5 client. However keep in mind that the servers is still 1.4.7 so new features in 1.5 will not work untill the sever is actually updated.

So to answer your question in short: no that's not going to cause any troubles