I was able to fully recover the 2010 TF2 menu:

http://i.imgur.com/cJZLAay.png

Yes... this means you can have avatars on the main menu. Or reference the player's username.

MainMenuOverride avatar:

	"AvatarImage"
	{
		"ControlName"		"CAvatarImagePanel"
		"fieldName"		"AvatarImage"
		"xpos"			"30"
		"ypos"			"20"
		"zpos"			"0"
		"wide"			"40"
		"tall"			"40"
		"visible"		"1"
		"enabled"		"1"
		"image"			""
		"scaleImage"		"1"	
		"color_outline"		"52 48 45 255"
	}

Player's name (you may have to cut off the "Welcome back," part depending on how you want to use it):

	"TopLeftDataPanel"
	{
		"ControlName" "EditablePanel"
		"fieldName" "TopLeftDataPanel"
		"xpos" "15"
		"ypos" "35"
		"zpos" "-10"
		"wide" "300"
		"tall" "65"
		"visible" "1"
		"PaintBackgroundType" "2"
		"bgcolor_override" "46 43 42 255"

		"WelcomeLabel"
		{
			"ControlName"	"CExLabel"
			"fieldName"		"WelcomeLabel"
			"font"			"HudFontSmallBold"
			"labelText"		"#WelcomeBack"
			"textAlignment"	"west"
			"xpos"			"70"
			"ypos"			"5"
			"wide"			"300"
			"tall"			"15"
			"autoResize"	"0"
			"pinCorner"		"0"
			"visible"		"1"
			"enabled"		"1"
		}
	}

change values as you see fit, whatevs. you can also use %playername% instead of #WelcomeBack, that should work too.

Hopefully Valve never deletes this leftover stuff from TF2's code. Otherwise it will probably break.