Field to show a user connession

Is there a way to create a field where I can choose one user from my connession and display it as a name (or avatar and name/username) linked to his/her profile, on my profile?

I mean something like: "in a relationship with: User A"

where "User A" is the user I selected from my connession list.

Could this be implemented in CB 2.0 if not possible at moment?

This is already available through the "Connection Paths" Tab. If you want it as a field move it to a not shown on profile position then use a tab substitution to render it in a delimiter field. Example substitution as follows.

[cb:usertab tab="18" /]

I suppose I did not explain clear what I need.

I would have a field like a drop-down list (or even multiple select list) where user can choose one (or more) user(s).

Example, User A is married with User B; User A and User B are connected, User A select in the field "in a relation with:", that show hes connections, User B.

It should be a drop-down list (or multi-select) field that autopopulates with user's connessions.

Is that possible?

Possible, yes; available out of the box, no. You'd need to create a new CB Fieldtype plugin for such a thing. Maybe the easiest approach is to allow Connection Types then add a connection type for "In a Relationship". You'd then use CB Query Field to query the members database for the user for a connection that has this type (take first entry) then do a join to the #__users table to get their username/name (however you want it displayed) and it'll output the results of the select query.

Will you consider such feature for CB 2.0?

It'll be possible with CB 2.x most likely. We'll have more, better, and dynamic fieldtypes.