God bless the letter K, and the paltry number of monsters whose name begins with that letter. It's a short entry!
Ki-Rin: The ki-rin, a horse-like aerial spirit with vast magical powers, first appeared in Supplement III. Statistically the only major change to them is the addition of an extra attack per round, a horn that deals 3-18 damage as a +3 weapon.
In OD&D they were said to be able to cast spells as an 18th level magic-user. That’s still the case in AD&D, but the number of low level spells they can cast in a day has been greatly increased. They still have psionic powers, and average more psionic points than before. It’s hard to tell whether they’re more or less powerful than before, though; in OD&D they could use every psychic power available to magic-users, and in AD&D they get 4 major and 6 minor abilities. AD&D’s psionic system is very different than that found in OD&D, so I can’t really gauge this until I get to the Player’s Handbook.
In OD&D they were said to have the powers of a djinni at double strength, and that’s still true, as is their ability to cast all air-based spells at double strength. One area in which they’ve been powered down is their Magic Resistance. It’s still sitting at a healthy 90%, but in OD&D they were completely immune to spells cast below 12th level, and that’s no longer the case. But with an MR that high, it will probably not make a great difference.
We also get confirmation that the ki-rin’s ability to converse with anyone is telepathic. And their skin is worth 25,000 gp, which is just a great way to try and lure your PCs into skinning a majorly powerful being of Lawful Good alignment.
Kobolds: Kobolds first appeared in OD&D Vol. 2, and their stats haven’t changed here. What has changed is the amount of detail given to them. Their society is described as tribal, like most of the D&D humanoids, and they have the usual selection of leaders and bodyguards. They are also said to keep wild boars and giant weasels in their lairs. Most kobolds use short swords, axes and clubs, with javelins and spears as missile weapons. They hate gnomes and other woodland fey like brownies and sprites. Nothing is mentioned about them being expert trap-makers, a thing that becomes standard later on. Nor are they described as dog-like or scaly in the text, although the illustration does depict them in that way. It's not the first time they've been drawn in that manner, though; I distinctly remember some dog-men kobolds in Swords & Spells.