This morning the speaking tube was put in his trach and he talks! Very softly - the nurses said it takes a lot of effort to talk through a speaking tube, especially before you're used to it - but he talks, in complete sentences, in response to what you say (though he still favors the head nod or shake as he gets more exhausted), answers questions, even asked some questions.
Then his physical therapists came and helped him (and they did very little, he did most of it) get into a wheelchair and let me wheel him around the halls for a while; after that, they took us to the physical therapy gym and had him use a standing platform, so he stood up twice. Again, that was almost entirely on his own - the physical therapists just made sure his feet were positioned correctly, then he hauled himself out of the wheelchair and balanced on the platform with his arms while the therapists and I spotted him in case he started to fall. He was so excited to be out of bed that about a minute and a half after he got in the wheelchair, he started trying to get up out of it - more than half successfully too. And the wheelchair had a seat belt, which it took him about 1.5 seconds to realize was an actual seat belt and push the release button, so then they put a tray on the wheelchair. He finally sat still once the therapist explained she planned on taking him to the gym but if he wouldn't stay in the chair and wait for the gym, she'd have to put him back in bed. He clearly wasn't too happy about that but also clearly understood and calmed down.
Starting about 6:30 tonight the question he kept repeating was "Please can I get out of bed? Pretty please?" and explaining that he couldn't about a million times broke my heart. He even made a sad face at me at one point - almost made me cry. Then I tried explaining that if he fell, he'd take longer to get better and it would take him longer to be able to come home with me, and that calmed him down for a bit. Even the Ativan the nurse gave him only calmed him for about 20 minutes. However, at 8:00 he got his pain meds and was out like a light, so rather than risk disturbing him by staying til 9 I just came home. He was undoubtedly exhausted but he made my whole year awesome today. Woohoo!