Since this is a user-to-user forum, nobody here knows what the future plans for Lightroom are. And anyone who knows is contractually prohibited from saying. Right now with Lightroom you can create presets to apply different settings quickly. But I cannot think of a situation where actions would expedite things greatly in a nondestructive editing environment.
As Jim Hess said: "we don't know".
That said, I agree with you: it would be highly valuable to have such (high-level) actions/macros in Lightroom. There is a (lua) scripting environment which supports a lotta stuff, but it takes a programmer to do much with it..
If you don't mind me asking: what would be your first macros/actions if such feature was supported?
Lightroom and Photoshop are different programs, and Lightroom isn't really suitable to recording steps. After all, it's inherently about managing and processing multiple images simultaneously, and it's almost part of its ground-up ethos that you shouldn't need actions or other borrowings from Photoshop. Repetition is reduced by presets and templates.
I think the most important question here is Rob's: "What would be your first macros/actions if such feature was supported?"
Because Lightroom already automates corrections, but in a different (and sometimes better) way than Photoshop. For example, in Photoshop you might use an action to record a string of adjustments to contrast, local contrast, curves, cropping, and lens correction. That could be a pretty long action. But in Lightroom, all you have to do is make a single preset and when you do, all of those steps are applied in one instant instead of having to wait for many Photoshop action steps to complete. Same with exporting: In Photoshop, making an output-specific version can mean recording a lot of steps for resizing, color conversion, sharpening, etc. But since Lightroom lets you save all those as an Export Preset, once again it only takes an instant to apply it. So a lot of times, automating is actually easier and faster in Lightroom.
What kind of automation are you after? Is it something that Lightroom presets haven't been able to cover?