Susanne,
If the Cattleya is in sheath, then you have about a month plus 1 to 2 weeks until flowering... buds will slowly emerge from the sheath in a few weeks... you won't see anything happening at this stage.
As for the one that matured without a sheath, that growth will never bloom... usually when this happens, it is either the new growth is not mature enough to bloom, or it is in incorrect conditions... but I would have to know which species you are dealing with to give you any further information upon proper culture... hybrids are usually easier, unless you are dealing with something like a Cattleya velutina x Cattleya schilleriana... =)
-Pat
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