sofort = immediately, right now
gleich = very soon, "in a minute"
bald = soon
The border is a bit nebulous, but sofort implies that an action is about to start while gleich is merely in the very near future (maybe in 5-15 minutes) and bald is in the reasonably near but not immediate future.
but in german, even if you know what you are talking about, you'd still use a personal pronoun (ihn, sie, es) as a placeholder. präsentieren without an object sounds extremely odd. well, to be exact, there are indeed two cases listed in the "duden" (main german dictionary) where it's allowed to be used intransitively: 1. in a strictly limited sense meaning parading in your best uniforms and showing your weapons 2. - surprise - as an anglicism! but trust me, i'm a 40-year old german woman and i never heard it that way.
Gleich means what mizinamo says it means in his post. So, you're right in the timing sense to think it means the same as "We are about to present". 'To be about to do something' is constructed in German with "im Begriff sein, etwas zu tun". So, that would be the literal translation of "we're about to do something" "Wir sind im Begriff etwas zu tun". Here, "Wir sind im Begriff zu präsentieren."
A good post on time words, like gleich: http://yourdailygerman.com/2012/09/19/gleich-sofort-nachher-bald-spater/
As far as I can see, 'present' used non-transitively refers to when an animal lowers its front end and raises its back end to signify its readiness for copulation.
'We are presenting in a minute.'
Presenting what? I would say 'We are giving a presentation in a minute' is the best and most natural translation.
The situation is the same in English and in German: the word "präsentieren"/"to present" is usually transitive. There are however, situations where the object of the presentation can be assumed and therefore be left out. This tends to be the case in business presentations (the object being "a talk" or "some slides"). Concerning the animal example: I don't know whether you can say so in English, but in German this need an object namely "die Zähne präsentieren" (" "present the teeth").