These are all wonderful ideas!
Here are the ideas i would like to be in v4:
appearence:
-simple colors, like white w/ a color or solid colors.
-the antenna
-instead of the keychain, the tags like the keitai and the connexion v3, mabey it says: TMGC and has a drawing of one (like some keitais)
-the heading on the tamagotchi would be: TMGC, with a drawing of one (also, like some keitais)
-different coloured backs, such as the haneruchi or the entama
new/changed features:
-mailing features via the computer, the when you connect, it sends the message(s)
-entering a password to get on tamagotchi town (like the entama)
-the games icon being only for games
-shoping icon, replacing the disapline icon, mabey 10 items in the shop instead of 4, and you can select different shops, such as clothing, food, toys, ect.
-note catching game, hammer game(from entama), heading game, and a new game
-items icon, replacing the light icon
-being able to choose the bedtime for each stage
-twins possible
-guts system, but w/ a new category, mabey athletics or strength, therefore, you can get jobs, go to school
-different medications, so tamagotchi can get different sicknesses, such as headache, asthma, heart attack (witch can happen if tama weighs too much, killing it, depending on the level of intensity)
-can connect to 3 or 4 tamagotchi at a time to have a tea party or something
-more animations
-being able to go to school
-purchasing extra activities?, such as a dance class or something
-some of the same charaters from v1, v2, v3, entama, keitai, haneruchi, + a fewnew charaters
extras:
-being able to select the language when you reset mabey english, japanese, spanish, french, ect.
-selecting your birthday and the tamagotchi's birthday where it has a party instead of just saying "happy birthday!"
-harder buttons, like the entama
That's everything i would like to be on v4, i would pay $35 for it!
I hope it has some of the features i said, if there is a v4...